tyre size-gearing

[fred]

i'm thinking of putting a 100/90 tyre on wide rims,anybody any idea how much,if at all it lowers gearing compared to a 3.50?
thanks,fred

[chris2470]

In real terms zero, use this handy tools as a guide.
http://www.tonycassidy.com/microsite/Ge ... liser.html

[fred]

cant view it.

[chris2470]

You will find it in the tuning & maintenance section :

http://scooterotica.org/tempforum/viewt ... f=5&t=1852

[fred]

sorry,should've put unable to view it. I haven't got excel,or whatever i need to download it.
Just handy to know,if tyre size makes a difference,as i use rev counter as speedo.

[chris2470]

Ok Fred sure.
Basically no real world difference at all.

[joespeed]

yes it will make a difference to the gearing,just fitted one on a ts and had to come down one tooth on the front sprocket to enable it to pull top gear ,sorry cant give the engine spec,
and you do not state what you are putting it on!
regards
joe

[fred]

it's a ported cast barrel 200. pulls well with li 150-17/48.torquey not revvy

[joespeed]

i sugguest you fit it and try it,being a gutsy thing you could be ok,
regards
joe

[corrado]

Overall diameter of a 100/90 is 444mm a 3.50 is 448mm. In theory the 100/90 should technically lower the gearing.

*Based on tech sheets from Sava.