Thread: rear upper shock mount

Originally Posted by Slunnie

It's some messed up engineering in my opinion and for the life of me I don't know why the poms do it either. The only value I can see is that it retains standard shocks, when really some longer shocks should be used and preferably the shock mounts raised, not lowered so that you ca make use of the full longer shock travel.

I am with you Simon

Cheers

Originally Posted by pawl

OK then, I've got my thinking cap on. My billies are 553mm extended and 346mm compressed with an effective travel of 207mm. If I go the long Pro Comps they are 672mm extended 405mm compressed with travel at 267mm. Now because the compressed length of the Pro comps is 59mm longer than the billies and standard shockies, I need to raise the shock mount 59mm to stop them overcompressing? correct?. Then 59mm from the effective downward travel of the Pro Comps is 267-59=208mm, which is virtually the same as the travel now on the billies with the standard mounts. Something here doesn't add up. I know that to work it out properly you would measure the bump stop clearance with the axles flexed up to gain max travel but it seems by going these longer shocks I'm not really gaining effective travel at all. Am I on the wrong track here?
And then because the extended length is longer I need to go longer brake lines, tieing in the springs or longer springs etc. But being 60mm longer after raising shock mount the rear wheel would be 60mm further down into that rut than the standard billies I suppose.

Hmmm, the maths isnt working. By adjusting the shock mount height you're just making the shocks compressed position the same where it mounts to the axle despite being a longer shock. The procomp shock has 60mm more travel than your Bilsteins, so you axles lowest position according to the shock will be 60mm lower. You're gaining 60mm worth of extra travel.