Rog's bump stops were the simplest and best mods ever for my more recent trads. Really worth doing to any trad with the rear hoop.
Nick
I'll definitely fit a set Nick, but not until I've raised my top damper mounts by 35mm to regain my lost damper compression travel.
For a long time now it's been clear to me the 20mm lowering blocks I fitted lost me 20mm of super valuable, and in very short supply compression travel. I also believe the BCC anti-tramp springs lost me a further 10mm of compression travel, this is born out in the measurement comparisons Roger and I have been running through together over a series of emails .
Thanks Rog
When we study the distance from the leaf spring to the centre of the top damper bolt we get 205mm on Roger's Plus 4, a Trad built in the same period as Monty. However, when I take the same measurement on Monty I get 175mm, a difference of 30mm. I've also taken some other measurements such as clearance between the axle tube and my inner wheel arches, and while everything tells us the top mounts only need to be raised by 30mm, I believe I can actually squeeze this to 35mm and still clear everything.
Five millimetres more doesn't sound like a lot, but with rear suspension compression travel in such short supply on our Trads I figure if I'm going to raise the top mounts, I may as well do so by as much as I possibly can, so 35mm it is.
But no more than 35mm
Once I've done this I can fit Roger's spring assisters, adjusting them with what I've calculatedto be a 30mm clearance (elastomers to leaf spring faces), and then finally a safe deletion of the Bilstein damper's 30mm bump stops, like this I should end up with 50mm of damper safe compression travel.
That is 35mm gained by raising my top mounts, plus 30mm from deleting the damper bump stops, gives me 65mm of compression travel. However, I will then deduct 15mm to keep the damper safe to finally give me the 50mm of safe usable compression travel. I believe the conical rubber elastomers used by Rog give a true maximum working compression of 20mm, so Ill set the spring to elastomer clearance at 30mm.
This will give 30mm of spring travel before the rising rate elastomers come into play, at the full elastomer compression of 20mm plus the 30mm, I will end up with rear suspension that has 50mm of damper safe compression travel in total with the last 20mm of this travel being a rising rate system that ensures progressive compression, thus eliminating the violent bottoming out behaviour that thankfully is actually quite rare on Monty.
Well, thats the plan
Dave
