fmcd92 wrote: Ciao Carlo,
Any actual rebound with those M1-Rs? I had to do 20w on rebound side which had two consequences, predictably.
Thanks heaps, both of you!
Fran
It's not that Fran and I haven't spent countless hours engaged in deep and rigorous testing and and modifications with the M1Rs... From way back in the loudbike blog archives (June 2005):
"The M1R responds well to tuning, and is an excellent fork for the contemporary vintage racer. It's known for a few foibles though - most notably, the completely useless rebound adjustment knob on the right side fork leg. We loudbike-types generally set ours to the 3rd out of 4th position - if only for the appearance that we wouldn't have to resort to the 4th position to make our forks work.
At the past Mosport event, I found that the new and improved F1 was feeling a bit on the wooden side of stiff, so after moving down to an Ultralight fork oil in the left ( compression) leg with no major improvement, I decided that an adjustment to the spring preload was in order. It's a fairly simple process really. First; call Fran over. He's the man when it comes to track-side precision hacksaw work. Next, debate the pro's and con's of jacking the front of the bike up to unload the front end. Decide against this approach, gash your right thumb when the loaded fork caps springs off of the top of the fork, and go off in search of a band-aid.
With the fork tube spacer in hand, find a suitable surface, debate the actual amount of material to be removed from the preload tube, and scribe with a vernier caliper.
Carefully balance on the top of the toolbox while placing as much weight on the tube with your right foot while giving Fran just enough room to work - and try to act nonchalant while striking such an awkward pose. It's important to give Fran just the right amount of encouragement while he attempts to cut a relatively straight path though the preload tube. Too much and he'll slap you upside the head. Not enough and he'll lose interest and go off in search of tea. Marvel at the skill and speed displayed by this seasoned professional.
Find a third party to load the socket while you and Fran wrestle to fork cap onto the loaded fork tube and spin the cap into position. Adam's really good at this kind of work. Repeat the process (except for the thumb bashing bit).
Stand back, have a smoke and remember (quietly, to yourself) that all this work has little if any effect on actual spring rate."
I should add that the preload we stumbled upon that day 5 years ago turned out to be perfect and after swapping out the tiny spring in the rebound adjuster circuit, I was able to dial in a set-up that worked brilliantly with Ultralight in the compression side and 20wt in the rebound side.
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