120 rear tire

TnNinjaGirl · April 27th, 2011, 05:49 AM

I have a couple of 120 rear tires lying around and was thinking of putting on on the back of my bike. Any idea why this would be a "dangerous" idea? If it isn't dangerous I will probably do it and report back, as I have not seen it done yet and cannot find any info one way or the other.

bob706 · April 27th, 2011, 05:59 AM

Will a 120 fit the back rim?

TnNinjaGirl · April 27th, 2011, 06:06 AM

Not sure.

SteveL · April 27th, 2011, 06:29 AM

I don’t see why not my front is a 120/70/17 and my front rim is a lot wider than the rear on the Ninja 250.

Steve

spooph · April 27th, 2011, 09:48 AM

What kind of 120 is it CB? Make, model, 120/xx-17?

My tire guy wanted to use a 125 on the rear of my bike for racing, he said it would be wide enough, but I think it was a 125/60-17 or something - a fairly small side-walled racing slick.... So I'm sure your 120 will fit if it's sidewall is at least a 70 - 80 would be better, but profile might be an issue if you like to lean... Then again, many tire manufacturer's have different profiles with the same numbers, fudging a bit here and there, so yea, need more specifics please...

Racer x · April 27th, 2011, 10:34 AM

I run 125 70 17. Or 115 80 17 rear 95 70 17 front Dunlop slick .there is no problem with the fit. They are made for road racing so I guess they would turn OK .

TnNinjaGirl · April 27th, 2011, 11:39 AM

120 70 17

Alex · April 27th, 2011, 12:30 PM

Is it designed to be a rear tire, or is it a standard 120/70/17 front tire?

spooph · April 27th, 2011, 01:29 PM

I'd mount it and see how it performs... It should fit...

TnNinjaGirl · April 27th, 2011, 02:40 PM

It was designed to be a front tire.

My thought on that is... if it can handle the front of a 120hp super sport. It would be able to hold all 30hp of screaming ninja fury... no??

spooph · April 27th, 2011, 06:04 PM

Yes! What does the tread look like? It's not THAT big of a deal, just a factor that should be considered...

TnNinjaGirl · April 27th, 2011, 08:06 PM

Like how much tread is left, or what is the design of the tread?

spooph · April 28th, 2011, 09:51 AM

Sorry, the design of the tread, yes.

TnNinjaGirl · April 29th, 2011, 04:52 AM

I'll post some pictures of them when I get some time but until then, why does the tread design matter?

Cali619 · April 29th, 2011, 07:19 AM

I think the question is if can handle the torque produced like the rear tires are designed for?

spooph · April 29th, 2011, 08:56 AM

ARG! Stupid machine just deleted my lengthy response. Probably a good thing. Let's try again...

Essentially I've heard unconfirmed theories that tread design influences the "turn-in" of a tire, the tire's willingness to bite in a corner and pull the bike down. Apparently rear tires are designed to push the bike up, opposite of the front tire. Brake - tread on front tire helps to dive into corner. Accelerate - tread on rear tire helps straighten bike out. So if you reverse them, the rear tread might cause unpredictable handling, at first....

I've also heard people say that tread is just missing rubber from a tire purely designed to move water away and offer grip in wetter conditions. I guess all I"m saying is make sure whichever tire you put on the back that you have more grip from the front tire than the rear. Recovering from a rear-tire slide is easier than a front-tire slide...

April 27th, 2011, 05:49 AM	#1
TnNinjaGirl Ms. Personality Name: CB Location: Murvill, TN Join Date: Jan 2009 Motorcycle(s): Depends on the week you ask Posts: A lot.	120 rear tire I have a couple of 120 rear tires lying around and was thinking of putting on on the back of my bike. Any idea why this would be a "dangerous" idea? If it isn't dangerous I will probably do it and report back, as I have not seen it done yet and cannot find any info one way or the other.

April 27th, 2011, 06:29 AM	#4
SteveL old git Name: Steve Location: Geneve Switzerland Join Date: Mar 2009 Motorcycle(s): BMW K1300S Posts: 479	I don’t see why not my front is a 120/70/17 and my front rim is a lot wider than the rear on the Ninja 250. Steve __________________________________________________ Some mistakes are too much fun to make only once.

April 27th, 2011, 09:48 AM	#5
spooph ninjette.org certified postwhore Name: Spooph Location: Golden, CO Join Date: Jul 2010 Motorcycle(s): '08 Ninja 250R Posts: A lot. MOTM - Oct '15	What kind of 120 is it CB? Make, model, 120/xx-17? My tire guy wanted to use a 125 on the rear of my bike for racing, he said it would be wide enough, but I think it was a 125/60-17 or something - a fairly small side-walled racing slick.... So I'm sure your 120 will fit if it's sidewall is at least a 70 - 80 would be better, but profile might be an issue if you like to lean... Then again, many tire manufacturer's have different profiles with the same numbers, fudging a bit here and there, so yea, need more specifics please... __________________________________________________ My therapist has 2 wheels and a seat. If you are ever in doubt to my tone, please refer to my avatar.

April 27th, 2011, 12:30 PM	#8
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	Is it designed to be a rear tire, or is it a standard 120/70/17 front tire? __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

April 27th, 2011, 01:29 PM	#9
spooph ninjette.org certified postwhore Name: Spooph Location: Golden, CO Join Date: Jul 2010 Motorcycle(s): '08 Ninja 250R Posts: A lot. MOTM - Oct '15	I'd mount it and see how it performs... It should fit... __________________________________________________ My therapist has 2 wheels and a seat. If you are ever in doubt to my tone, please refer to my avatar.

April 27th, 2011, 05:59 AM	#2
bob706 ninjette.org certified postwhore Name: Sean Location: Mary Esther, FL Join Date: Jan 2009 Motorcycle(s): 2008 Ninja 250 1998 HD Road King Posts: A lot.	Will a 120 fit the back rim?

April 27th, 2011, 06:06 AM	#3
TnNinjaGirl Ms. Personality Name: CB Location: Murvill, TN Join Date: Jan 2009 Motorcycle(s): Depends on the week you ask Posts: A lot.	Not sure.

April 27th, 2011, 10:34 AM	#6
Racer x ninjette.org certified postwhore Name: Eric Location: Iowa City Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot. Blog Entries: 54 MOTM - Sep '18, Feb '16	I run 125 70 17. Or 115 80 17 rear 95 70 17 front Dunlop slick .there is no problem with the fit. They are made for road racing so I guess they would turn OK .

April 27th, 2011, 11:39 AM	#7
TnNinjaGirl Ms. Personality Name: CB Location: Murvill, TN Join Date: Jan 2009 Motorcycle(s): Depends on the week you ask Posts: A lot.	120 70 17

April 27th, 2011, 02:40 PM	#10
TnNinjaGirl Ms. Personality Name: CB Location: Murvill, TN Join Date: Jan 2009 Motorcycle(s): Depends on the week you ask Posts: A lot.	It was designed to be a front tire. My thought on that is... if it can handle the front of a 120hp super sport. It would be able to hold all 30hp of screaming ninja fury... no??

April 27th, 2011, 06:04 PM	#11
spooph ninjette.org certified postwhore Name: Spooph Location: Golden, CO Join Date: Jul 2010 Motorcycle(s): '08 Ninja 250R Posts: A lot. MOTM - Oct '15	Yes! What does the tread look like? It's not THAT big of a deal, just a factor that should be considered... __________________________________________________ My therapist has 2 wheels and a seat. If you are ever in doubt to my tone, please refer to my avatar.

April 27th, 2011, 08:06 PM	#12
TnNinjaGirl Ms. Personality Name: CB Location: Murvill, TN Join Date: Jan 2009 Motorcycle(s): Depends on the week you ask Posts: A lot.	Like how much tread is left, or what is the design of the tread?

April 28th, 2011, 09:51 AM	#13
spooph ninjette.org certified postwhore Name: Spooph Location: Golden, CO Join Date: Jul 2010 Motorcycle(s): '08 Ninja 250R Posts: A lot. MOTM - Oct '15	Sorry, the design of the tread, yes. __________________________________________________ My therapist has 2 wheels and a seat. If you are ever in doubt to my tone, please refer to my avatar.

April 29th, 2011, 04:52 AM	#14
TnNinjaGirl Ms. Personality Name: CB Location: Murvill, TN Join Date: Jan 2009 Motorcycle(s): Depends on the week you ask Posts: A lot.	I'll post some pictures of them when I get some time but until then, why does the tread design matter?

April 29th, 2011, 07:19 AM	#15
Cali619 Giggity Giggity Name: Ryam Location: San Diego Join Date: Feb 2009 Motorcycle(s): 08 ninja 250R aka Hiryu Posts: 481	I think the question is if can handle the torque produced like the rear tires are designed for? __________________________________________________ Facebook DY Fender chop, Danmoto CB slip-on w/baffle, Airbox removed, Kleen-air removed, shimmed needles, Mikuni #117.5 Main jets, K&N RU-1822 air filter pods

April 29th, 2011, 08:56 AM	#16
spooph ninjette.org certified postwhore Name: Spooph Location: Golden, CO Join Date: Jul 2010 Motorcycle(s): '08 Ninja 250R Posts: A lot. MOTM - Oct '15	ARG! Stupid machine just deleted my lengthy response. Probably a good thing. Let's try again... Essentially I've heard unconfirmed theories that tread design influences the "turn-in" of a tire, the tire's willingness to bite in a corner and pull the bike down. Apparently rear tires are designed to push the bike up, opposite of the front tire. Brake - tread on front tire helps to dive into corner. Accelerate - tread on rear tire helps straighten bike out. So if you reverse them, the rear tread might cause unpredictable handling, at first.... I've also heard people say that tread is just missing rubber from a tire purely designed to move water away and offer grip in wetter conditions. I guess all I"m saying is make sure whichever tire you put on the back that you have more grip from the front tire than the rear. Recovering from a rear-tire slide is easier than a front-tire slide... __________________________________________________ My therapist has 2 wheels and a seat. If you are ever in doubt to my tone, please refer to my avatar.

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