[_Hammy]

They're about 35mm long which is the same as the distance from the fork tube to the end of the bump stop bolt (lower triple clamp) on my Sachs

So I used that as my goto measurement, but you can pull the steering tighter and compress the rubber with still quite a safety margin.

I can probably take 10mm off them before the fork tubes hit the radiator, but I think I'll take it for a proper ride test first

Edit: the fork tubes hit the bump stop, not the lower triple, so perhaps thats the difference?