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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 18 Feb 2010
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What happens?

Hey all!

I got one question: What happens when you use a tire that is suited for one rim size(wide) on a smaller wide rim?

The thing is, I got a 21"x1.60 EXCEL front rim and for the MOT I have to use the stock front wheel size tire 90/90-21

What happens if I use the 90/90-21 tire on the 21"x1.60 rim?


NOTE: 90/90-21 is fit for a 21"x1.85 rim....


Thanks!
Vando
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Old 19 Feb 2010
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nothing! :-)

there are some bikes (talking about yamaha) that are approved for use of a 90\90 21 on a 21x1,60 rim, so taking out legal matters (insurance in case of crash, if you bike documents are different) you can use a 90\90 21 on that rim.
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Old 19 Feb 2010
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That's good to know!

on my documents it only mentions the size of the tire... there is no reference to the rim size width...

How about in terms of riding?
I imagine the tire in the 21"x1.60 rim would make it "rounder" if you know what i mean...

The middle part of the tire will surely degrade faster but.....
What happens in terms of handling?

I like to lean and accelerate into the curves lol...



Vando
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Old 19 Feb 2010
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On a sportsbike, having a tyre on a narrow rim (or, more usually, running a wider tyre than the rim is designed for) deforms the tread and can lead to instability and unpredictable behaviour. On an XT - not sure if you would notice
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Old 19 Feb 2010
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My other ride has a narrower front rim than the xt, i use the same tires and cant tell the difference....
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Old 19 Feb 2010
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As Jens says - don't think it'll really notice too much on one of these machine, not exactly a "precise track machine".

May stand out a bit on Rossi's MotoGP bike...... !
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Old 20 Feb 2010
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Hi guys!

Nice!
That'll surely keep me from wasting some cash on new rims for a while at least... and keep the EXCEL rim :P

Thanks for the input!
Vando
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