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Hi there, I own three GS400’s (a stock regular rider, a mild street-tracker project and a parts bike.) I was looking to order some new tyres for my regular rider which is running:
100/90 18 56h rear and a 90/90 18 front.
I was looking at the Avon (RoadRunner) and Bridgestone (BT45) websites (pretty much the only tyres available in the UK) for fitment specs when I noticed that my rims:
1.65 front, 1.85 rear
are undersized according to their minimum rim widths:
1.85 front, 2.15 rear
I looked at my other bikes and they are both running:
4.00 x 18 rears
which I believe is the equivalent to 110mm. The original factory spec is for a:
3 inch front and 3.5 rear
which only seem to covered by Dunlop with their K82 that has a very ‘classic’ profile.
I am guessing that the tyre manufacturers are a little conservative with their specifications and I understand the problems associated with bead seating when putting a marginally oversized tyre on a narrow rim.
I guess my question is has anybody had any experience of/has heard of an oversize tyre rolling off a rim? Or would they feel comfortable fitting a tyre marginally oversized? Or should I stick rigidly to manufacturer specs and fit the Dunlops and lose the benefits of a more modern profile? All opinions welcome. Cheers.
100/90 18 56h rear and a 90/90 18 front.
I was looking at the Avon (RoadRunner) and Bridgestone (BT45) websites (pretty much the only tyres available in the UK) for fitment specs when I noticed that my rims:
1.65 front, 1.85 rear
are undersized according to their minimum rim widths:
1.85 front, 2.15 rear
I looked at my other bikes and they are both running:
4.00 x 18 rears
which I believe is the equivalent to 110mm. The original factory spec is for a:
3 inch front and 3.5 rear
which only seem to covered by Dunlop with their K82 that has a very ‘classic’ profile.
I am guessing that the tyre manufacturers are a little conservative with their specifications and I understand the problems associated with bead seating when putting a marginally oversized tyre on a narrow rim.
I guess my question is has anybody had any experience of/has heard of an oversize tyre rolling off a rim? Or would they feel comfortable fitting a tyre marginally oversized? Or should I stick rigidly to manufacturer specs and fit the Dunlops and lose the benefits of a more modern profile? All opinions welcome. Cheers.
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