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Old August 24th, 2022, 04:07 AM   #1
Shafer
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Lower tire load index than oem spec

07 ninja

Oem load spec- 50f 64r

Im looking to get Pirelli MK75 rear tire. And front.
Spec: PIRELLI 120/80-16 M/C 60T MT75

Rider weight: 145lbs
07 ninja wet: 362lbs
60 load weight: 551lbs
Margin: 44lbs

Is it safe to purchase this tire? Thanks in advance for your help!
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Old August 24th, 2022, 07:05 AM   #2
InvisiBill
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Are you going to have a front wheel and tire too? I'm not sure what the exact weight distribution is on a Ninjette, but having a second tire means that each one will only have to support about half of that 507lb. Going from a 64 to a 60 in the rear is decreasing the total load capacity from 1036lb to 970lb.
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Old August 24th, 2022, 07:11 AM   #3
Shafer
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Thanks for the reply. I will have the pirelli mt75 on the front as well with the same load rating as the rear.

I know many members use the mt75 maybe there is a model with a higher load index but I couldn't find it.

This bike is ridden by my GF who is 5.5 so I want to get a decent tire with a shorter aspect ratio. 90 would be to tall for her so trying for something with a 80.
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Old August 24th, 2022, 01:32 PM   #4
DannoXYZ
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Load index is combined weight + speed rating on heat-buildup and stability. It's how much weight it can carry and shed heat fast enough to be stable at rated speed. So MT75 120/80-16 has 60T load/speed rating. It will reach maximum safe temperature at continuous 118mph while carrying 551-lbs of load.

If you're not going to be riding at 118mph all the time, tyre will actually be cooler and can carry even higher load at limit temperature. Of course, actual load will be lower and you'll be even further away from limit. There are many other tyres in this size with 60H and 60V ratings for 130 & 149mph speeds while carrying same 551-lb load. Carrying it at MT75's 118mph limit is piece of cake for them with a lot more overhead.

Don't overthink it, load-rating doesn't have any relation to safety on bikes. Situation awareness and reflexes are most important to staying alive. As far as tyres, grip is more important than load-rating. So go for more modern tyre design and compound with better grip than MT75.
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Old August 24th, 2022, 01:33 PM   #5
Shafer
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Thanks that makes a lot of sense.
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