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Discussion Starter #1
Hi, i want to change to adventure tires, and any knows about 150/70 17 rear tire will fit? (original 150/60 17, instead of changing the front sprocket)

Regards Børge :)
 

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No personal experience, but....

If you look up the specs of the GS, that is the tire BMW are using.

Since the R and the GS share most of their frames, it should be OK....

Personally I wouldn't be scared of doing this

RobertB
 

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No personal experiences either but let's do some quick calculations :
Stock tire: Width: 150mm Height: 60% of width = 90mm
Other tire: Width: 150mm Height: 70% of width = 105mm

That's 15mm difference, when you apply that height on the circumference, putting the 2 tires on the floor side by size, you'd see a 30mm overall difference in height.

Clearance wise, the only part I can think about is the inner mudguard (which is a different part on the R than on the GS), but just looked at it and it seems it will accommodate an extra 15mm without issues.

Last and more unknown variable is suspension when fully compressed: the tire will be 15mm closer to the frame/underseat area, but not likely touching anything :) - just a guess, no calculation here :) and like bbbelanger says, if frame/suspension/swingarm from GS are the same size/geometry than the R, then this is not likely to be an issue.

Seat will be a little higher and bike will lean a little more when on the side stand, but nothing drastic. Handling of the bike will likely feel a bit different too. You'd leave the front tire stock ?
 

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Discussion Starter #4
Thanks for answer :) Fronttire, im not sure,but if it will fit,i could go one size bigger there too :)
 

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I was just at the dealer this PM.

Saw the GS and R side to side.

I'm very confident that the Tourance tire on the rear of the GS would fit the R...Again no measurements apart from my Eyeball V.1

As for the front, The GS has a 19 inch wheel vs 17 for the R so not a direct fit... also the fender is very close to the tire....
so Apart from close measurement with tires side by side I can't recommend anything on that front.


RobertB
 
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