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GS550t Rear Tire correct size?

C

CafeRookie

Forum Apprentice
Hey,

I'm buying my first set of tires for my 1981 GS550T.

Stock:
Front: 3.75-19
Rear: 4.25-17

I can't figure out the rear tire conversion. I've called two tire shops and they have a hard time figuring it out too. There are only a couple of conversion charts that list 4.25 as a rear tire option. The charts list the 4.25 as 110/90, but I can't find any tires 110/90-17 tires.

Can/should I just go up a size and get 120/90-17? Any suggestions? I would like to buy something similar to Shinko 005 Advanced tires.

Any thoughts?

Thanks,

Mike
 
Using 25.4 mm per inch, the literal conversions are 82.5 for the front and 108 for the rear. Of course, those sizes are non-existant, so go with a 90 on the front, and you can safely go to a 120 for the rear.
 
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