Scooterotica

Hi,

I usually use S1 tyres, 100/90-10 but would like to try Michelin City Grip. I can’t seem to find them in 100/90-10 but can in 100/80-10. Therefore me question is will 100/80-10 be good on a Lambretta with normal and wide rims?

Thanks in advance,

Treeman

The 80 Tyre has a smaller height than the 90 therefore it would reduce your gearing. I. E. 100/90 = 100mm wide and height 90% of width which is 90mm. Same principal 80% is 80mm height.

Thanks for that Shaunbond, as I don’t understand what lowering the gear would do, what effect would it have on the performance of the scooter?

Don't know to what degree but it would increase your revs. Higher cruising revs but maybe a bit better on acceleration.

Thanks again Shaunbond. So how does a 100/90-10 compare to a 3.50 -10? Are they similar so they don’t effect over revving at higher speeds etc? I did some research and found something that suggests that the change of 100/90-10 to 100/80-10 maybe around 3%? I used to use back in the day 400-10, would that have increased the gearing so it would rev lower at higher speeds?

Don't worry too much about your gearing. I bought a 100/80 to try and haven't yet fitted it........it looks too small compared to the 100/90. I live in York if you want to see it and make a decision.

Treeman - 100/90 is about 10mm Wider than a 3.50 but the same height. 90/90x10 is as near to a 3.50x10 in metric sizes.

Take Mick1 up on his offer so you can see.

I would stick with the size you want, plenty of choice here..

https://www.lambrettaspares.com/search/Tyres.html

Fitted my City Grips last month. Nice tyres and they feel better than my previous S1's.

Chris in Margate wrote: ↑Sun Aug 20, 2017 7:31 am Fitted my City Grips last month. Nice tyres and they feel better than my previous S1's.

are they 100/80's ?