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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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a river in NW Mongolia



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  #1  
Old 17 Feb 2010
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Rear tyre pressure (on road)

I bought my XT recently and it came with new tryes.
I would have preferred the Bridgestone or Dunlops but they fitted Kingstires.

I would like to know the correct rear tyre pressure for on road use (I know I would need to let a few pounds out for off road).

The owners manual says 21 PSI up to 90KG and 32 PSI over 90KG.
I weigh 90KG fully kitted out.
The shop I bought it from says 26 PSI rear.
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  #2  
Old 17 Feb 2010
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Try it out =)

I cant feel if im running 1,5bar or 2,2bar

Its usually somewhere in between.
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  #3  
Old 17 Feb 2010
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I have tried it out at 26psi and 21psi.
For some reason I feel more confident leaning/cornering at 21psi in the rear.

But I just wondered if there was any science behind having tyres at certain pressures for road use.
I guess more of the tyre is in contact with the road at lower pressures.
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Old 17 Feb 2010
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You don't say what tread pattern (road, adventure ot knobbly) ?

Just set them to what YOU prefer!
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  #5  
Old 17 Feb 2010
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Many riding Dual sport bikes on the road run too high a pressure, holding onto some preconceived but misguided theory left over from 500 lb. sports bikes. IIRC, your XT weighs "about" 365 lbs. wet. (166 kgs.)

Yamaha are wise to post a variance based on load/rider weight. But tire types can vary some too and of course conditions.

I think you are very close to spot on. I would run:
26 psi rear
22 psi front.

I think you will find you will get the best wear with these pressures for most dual sport 50/50 tires. Many will tell you to run 32 rear, 28 front, or even higher. I have done it and it may ride OK but tires will wear faster. A lower pressure is also much safer in any sort of wet condition and also in aggressive cornering. Trust me on this one.

If you were to load up the bike or add pillion, I'd go to maybe 30 rear, 25 front, more / less.
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  #6  
Old 18 Feb 2010
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Thanks for the replies.

The guy at the shop told me they are biased towards road use.

Rear tyre is 4.60 17 62S whatever that means.
Front is 90/90 -21 60T.

Mickey you are correct, the bike with oil and petrol is 365lb ish.

I'll try out 26PSI in the rear.
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