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Old December 21st, 2019, 06:30 PM   #81
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Carbon-fiber does have significantly more strength to weight. One place it can’t be used is in aircraft wings due to needing to be flexible.
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Old December 21st, 2019, 11:23 PM   #82
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Oh, but CF is used extensively in wings. Airbus is building A350s for Qatar entirely from CF. Nice thing about CF is it can be as stiff or as flexible as you want depending upon how many layers and direction of fibres you lay down (anisotropic). 3D-weaving to eliminate separation between layers has even more customization options.





http://compositesmanufacturingmagazi...-first-flight/
https://www.boeing.com/777x/reveal/s...mpletes-parts/
https://www.youtube.com/watch?v=QpCH9mUUEnY

Interesting development with CF is self-healing wings. The matrix includes micro glass spheres filled with healing fluid. If cracks develop, it breaks these spheres and fluid leaks out. Which then solidifies and holds cracks together!

Also recently got info from my 1st employer, Ames Research @ Moffett Field, that they're experimenting with CF for helicopter rotor-blades. Which faces lots more stress per unit area than plane wings. Next breakthrough for CF in aviation is jet-engine fan-blades made from CF!!!
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Old December 22nd, 2019, 12:11 AM   #83
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Carbon frames are a thing, but the manufacturers are having a tough time figuring out how to tune them effectively. Steel and aluminum is very well understood in the motorcycling world.

It's actually amazing how far ahead bicycle companies are. The focus on weight savings is amazing. The suspension development is right on-par with the best Motorsports items, very rare to find un-adjustable suspension. 2 way adjustable with preload is standard, 3-way is much easier to find, and 4-way rear shocks are finding a good foothold in the market.

Motorcycle companies seem to shy away from lightweight bikes. There's issues with cross-winds and big truck drafts, a lighter bike means more attention needs to be paid to suspension tuning. Lighter bikes also tend to pick up the front wheel much easier. That said, a lighter bike is worlds better in the hands of someone who knows how to use it. KTM seems to be the only major manufacturer who actively tries to reduce weight.
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Old December 22nd, 2019, 08:37 AM   #84
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@DannoXYZ I stand corrected. Thanks for the info.
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Old December 22nd, 2019, 01:16 PM   #85
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Quote:
Originally Posted by Snake View Post
@DannoXYZ I stand corrected. Thanks for the info.
You're welcome! Amazing advancement of technology! Just blink and its at next level already! And that's just for declassified stuff...

Quote:
Originally Posted by mr2peak View Post
That said, a lighter bike is worlds better in the hands of someone who knows how to use it. KTM seems to be the only major manufacturer who actively tries to reduce weight.
I really like my brother's KTM RC390. It has even more aggressive geometry than Ninja 400 and with less weight, it feels like riding a bicycle! Ari Henning just set new record at Sears Point Sonoma on RC390!

CF moto frames may be pushing diminishing returns for bang-for-buck value. Well-designed and hand-built chromoly trellis frame can be made in 14-16lb range for 30-70bhp bike. Would require lots more effort and money to create similar CF frame with minimal additional benefits. Might be worth it for larger markets like tennis-racquets or bicycles, but numbers in moto market doesn't justify it currently.

Would be interesting to stuff EX250 or Ninja 400 engine into RC390 frame... saves 20-30bs right away (or 100lbs in case of EX500).

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Old December 22nd, 2019, 04:44 PM   #86
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The day motorcycles make a jump in weight loss will be the day they incorporate a composite engine/transmission. Car manufacturers are already playing with composite engine blocks.

Iíll be happy with my aluminum or iron block honestly. But time marches on regardless of personal preference.
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Old December 22nd, 2019, 08:47 PM   #87
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Quote:
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Would be interesting to stuff EX250 or Ninja 400 engine into RC390 frame... saves 20-30bs right away (or 100lbs in case of EX500).
Or you can look at is as adding a bunch of weight to the RC390. 400 makes the same peak power, not much sense. I wonder how much more power the frame can handle before running in to issues.
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Old December 22nd, 2019, 10:48 PM   #88
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That weight figure canít be right. 426 lbs would be a porker! That will kill acceleration and my interest.
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Old December 23rd, 2019, 08:07 AM   #89
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That weight figure canít be right. 426 lbs would be a porker! That will kill acceleration and my interest.
That's what I'm thinking...
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Old December 23rd, 2019, 11:49 AM   #90
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Quote:
Originally Posted by JFMNINJA400 View Post
That weight figure can’t be right. 426 lbs would be a porker! That will kill acceleration and my interest.
Quote:
Originally Posted by jkv45 View Post
That's what I'm thinking...
Let's take original ZXR-250 as starting-point.



~355 lbs
-10 lbs going to single front disc-brake
+5 lbs ABS
+5 lbs EFI w/traction-control in ECU
+5 lbs steel frame
-----------------
~360 lbs or same as current Ninja 400 non-ABS

Not sure where extra +65-lbs on top of that comes from. Unless they are just using parts from common parts-bin such as heavier 600 wheels, tank, or 600 engine block sleeved down to 250???. That weight would make sense then if entire bike is 600 with sleeved down engine... hmmm..
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Old March 1st, 2020, 08:48 AM   #91
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Specs will be announced on March 4th, Asia time. I believe in Thailand.
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Old March 1st, 2020, 09:02 AM   #92
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Specs will be announced on March 4th, Asia time. I believe in Thailand.
Should be very interesting!
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Old March 18th, 2020, 07:10 AM   #93
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https://newatlas.com/motorcycles/kaw...g-weenie-bike/
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Old March 18th, 2020, 08:00 AM   #94
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That video was a tease, waiting for some hard numbers like weight and horse power and who is getting this little beast!!!🙄
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Old March 31st, 2020, 09:01 AM   #95
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Latest ZX-25R info -

KAWASAKI ANNOUNCE RACE ONLY CARBON FIBRE ZX-25R

https://www.visordown.com/news/new-b...n-fibre-zx-25r
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Old March 31st, 2020, 11:26 AM   #96
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OOohh, AAahhhh cool, heh, heh!!!

Too bad it's so yooooglie looking!

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Old April 10th, 2020, 04:12 AM   #97
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Old April 10th, 2020, 11:32 AM   #98
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so it IS real
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Old May 11th, 2020, 06:07 AM   #99
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ZX-25R accessories -

https://www.visordown.com/news/new-b...ssories-zx-25r
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Old May 24th, 2020, 08:55 AM   #100
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Johnathan Rea on the ZX-25R -

https://www.visordown.com/news/new-b...awasaki-zx-25r
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Old May 24th, 2020, 11:04 AM   #101
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As Ahnold said in Predator, "You are one ugly motherfvcker!"

I get a reaction like someone unfolding all 15 blades of massive Swiss-army knife and tossing it in my lap! Yack! I just want to run away!!!




Link to original page on YouTube.

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Old May 24th, 2020, 12:36 PM   #102
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Quote:
Originally Posted by DannoXYZ View Post
As Ahnold said in Predator, "You are one ugly motherfvcker!"

I get a reaction like someone unfolding all 15 blades of massive Swiss-army knife and tossing it in my lap! Yack! I just want to run away!!!

Not a fan either...
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Old May 25th, 2020, 06:18 AM   #103
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Originally Posted by DannoXYZ View Post
As Ahnold said in Predator, "You are one ugly motherfvcker!"

I get a reaction like someone unfolding all 15 blades of massive Swiss-army knife and tossing it in my lap! Yack! I just want to run away!!!




Link to original page on YouTube.

I canít see itís face from the saddle.
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Old May 25th, 2020, 07:08 AM   #104
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I canít see itís face from the saddle.
I like the styling! To each his own.
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Old June 9th, 2020, 06:15 AM   #105
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ZX-25R news -

https://www.visordown.com/news/new-b...ervations-open
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Old June 9th, 2020, 07:59 AM   #106
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I am still kinda sorta interested, donít know if it will make it to the US. Still waiting on specs and pricing.
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Old June 30th, 2020, 08:30 AM   #107
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following up from other thread...

Quote:
Originally Posted by jkv45 View Post
Here's the latest promise (yesterday, 6/29/20), launching in Indonesia July 10, 2020 -

https://bikeadvice.in/kawasaki-zx25r...ate-indonesia/

So...it sounds like it is really gonna happen (maybe).

Did Honda ever release the CBR250/300RR twin in Indonesia or India? There was a bit of buzz about that a year or so ago - just like the Ninja.

Don't know if it ever happened, and why it never came here if it did.
Apparently CBR250RR was made in Indonesia from 2017 for Asian markets only.
https://www.cycleworld.com/2017-hond...its-beautiful/
https://www.bikesrepublic.com/featur...ood-for-words/

Some minor updates for 2020 with additional power.
https://www.timesnownews.com/auto/bi...ng-bike/569431

They really need to get rid of that hideous muffler.
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Old July 8th, 2020, 09:41 AM   #108
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Well the official launch here in Thailand is now scheduled for July 10th.

However the expected price, lack of power, and lack of adjustable suspension has pretty much killed my interest in the bike. Lack of power could be forgiven if the suspension was somewhat adjustable, but it looks like it will need cartridge kits, and at that point I might as well just get something else because it's not nearly as track ready as Kawasaki seems to say it is, and that was basically the allure of the thing.

It better be really damn light.
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Old July 8th, 2020, 07:53 PM   #109
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Yeah, weight is my major concern with getting one. Suspension can be upgraded, but extremely difficult to remove significant amounts of weight from heavy frame.
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Old July 8th, 2020, 10:53 PM   #110
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Fully track prepped N400 for $9k, vs this which needs a few more grand too be ready, vs ~$8k for a lightly used duc 848 ready to go... Don't see this thing being very popular.

I'm really upset about the lack of adjustability. They really dropped the ball there.
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Old July 9th, 2020, 11:58 AM   #111
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They should make race-version. Either with adjustable suspensions, or with no suspension at discount and racers can install their own. Maybe even do Porsche GT2/GT3 way and charge extra to remove things like power-windows, power heated seats and AC to save weight.
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Old July 9th, 2020, 05:19 PM   #112
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So it's 10-july now in New Zealand and Indonesia. What's latest news on ZX-25R???
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Old July 9th, 2020, 06:31 PM   #113
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Are they shills? Is it real? Or is it Memorex?

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Old July 10th, 2020, 02:51 AM   #114
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Boo.... so disappointing!

50 bhp
17 000 rpm redline
400 lbs !!! “Kerb weight”, whatever that means...
116 mph top-speed, that's 5mph slower than Ninja 400!

https://www.zigwheels.com/news-featu...=1594374548407

https://m.dailyhunt.in//news/india/e...sid-n197384090

https://www.google.com/amp/s/www.bik...js_v=0.1#ampf=

I’m gonna buy that 1994 CBR250RR I saw on Craigslist.

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Old July 10th, 2020, 03:27 PM   #115
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Kawasaki Thailand website was down most of the day. They pushed back the reveal to July 14th motor show, possibly unveiling on the 17th now.... I think I've lost faith. Ninja 400 seems like a much better deal unless you have crazy displacement taxes like Indonesia. Too bad, I wanted a race bike, not a tax dodge.

Race version is available, but you have to buy a standard bike, and then buy all the parts from their official parts suppliers to convert it. Once you do that, you will have a bike that can legally compete in the one-make series.
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Old July 10th, 2020, 03:32 PM   #116
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Yeah, best bang-for-buck track bike is Ninja 400. Very light ~300lbs is within reach, can get +50bhp easily.
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Old July 11th, 2020, 02:13 PM   #117
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Walking around Kawasaki store.

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Old July 18th, 2020, 05:27 AM   #118
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Quote:
Originally Posted by thunderkat59 View Post
Hello Ninjettes,
I looked in the FAQ and didnt see anything about posting links, so I am posting this link related to a Ninja 250 i4 that is going to Asian markets, 50 hp claimed

https://www.asphaltandrubber.com/bik...-25r-official/

I am drooling over this little bike. Maybe some will make it over here via 'gray market'?

Be safe!
Lem in KY


OK, I see this has already been posted, Mod, please delete!! Sorry about that!
Very disappointing specs compared to '90s version. It's a full 45-lbs heavier with similar power. Back then, there was gentlemen's agreement between manufacturers to limit power to 45bhp. However it was simple to remove limiter by clipping or grounding certain wires on ECU. Or in Honda's case, just plug in different smart-card.

Dave Moss has been giving everyone fits with his '94 CBR250RR. We suspect he's got 55-60bhp from his lap-times. Was hoping ZX-25R's dual-power rating would in that range, but NO, it's only 2bhp more than base model.

I can live with 50bhp, but that extra 45-lbs just kills all handling and braking performance. Imagine taking an R6 or CBR600RR and removing 60% of power, but keeping all the weight. It's gonna be a pig!!

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Old July 18th, 2020, 06:19 AM   #119
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Originally Posted by DannoXYZ View Post
Very disappointing specs compared to '90s version. It's a full 45-lbs heavier with similar power. Back then, there was gentlemen's agreement between manufacturers to limit power to 45bhp. However it was simple to remove limiter by clipping or grounding certain wires on ECU. Or in Honda's case, just plug in different smart-card.

Dave Moss has been giving everyone fits with his '94 CBR250RR. We suspect he's got 55-60bhp from his lap-times. Was hoping ZX-25R's dual-power rating would in that range, but NO, it's only 2bhp more than base model.

I can live with 50bhp, but that extra 45-lbs just kills all handling and braking performance. Imagine taking an R6 or CBR600RR and removing 60% of power, but keeping all the weight. It's gonna be a pig!!
Hey Danno, thank you very much for replying to my dup thread post... As you might have gathered, I absolutely flipped when I saw this, I mean like Speed Racer/Spridal and Chim Chim eyeballs popping out as the Mach5 heads off the cliff, style flip-out I cannot believe I missed this for a whole year! I need to get out more, but, i digress ...
I agree with you, the weight is a deal-killer. The 50hp--for me--is good, Im OK with that, but the weight was one thing that made me immediately gravitate to the Z4. I got pretty much the same feeling looking/sitting on the Z4 as I did with the RD400 in 1978. After getting off of a BMW, the Z400 was a revelation, I could never go back. Kawasaki makes great retro bikes, hope springs eternal for a retro ZXR250
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Old July 18th, 2020, 12:08 PM   #120
DannoXYZ
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Name: AKA JacRyann
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Join Date: Dec 2011

Motorcycle(s): CB125T, Ninja250R racer, Ninja250R street bike, EX250F#1, EX250F#2, EX250E, VF500F, CBR600RR

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Yeah, after hopping off heavy supersports onto ninjettes, I'll never go back. Light weight is so much more fun!

Well, one good thing about ZX-25R is it's not going to cost $9-10k like original estimates. But I still can't get over the weight. How did they make negative progress in 20-yrs?

I just picked up NSR250R frame for my 2-stroke project. It does weigh 30-lbs less than Ninja 250R frame, so going from alloy to steel frame added some weight. I suppose to keep costs down, they did away with lots of engineering to keep weigh low. Because it is possible to make lightweight steel frames.

Also picked up 3x CBR250RRs in boxes. Should be enough to build 2x bikes I think. There's a group of geezers that started racing these things about 15-yrs ago and lots of them are getting out. It's a little lighter than old ZXR-250 and has more international support as far as parts goes. We'll see what 19 000 RPM redline with gear-driven cams sounds like soon enough!
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