Originally Posted by Deejay
Originally Posted by sospan
Sizes are the same, both 15” and 60 profile so there shouldn’t be any speedometer issues.

Sorry, but beg to disagree. The 60 is the aspect ratio of the tyre which is the percentage of width to give height of tyre. So as the width is increased, so too is the overall diameter, even though rim size and aspect ratio are the same.

Agreed. When the stainless 7 x 16" rims were spec'd on the Roadsters instead of standard 15", they dropped the tyre aspect ratio from 60 to 55% to compensate and so maintain similar circumference.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone