Caliper placement re-birth
Caliper placement re-birth
(OP)
thread78-253307: Caliper placement
Found this and thought of the caliper placement thread once again, interesting, thats all,
3/4 of the way down link, twin calipers nicely packed in there!
Found this and thought of the caliper placement thread once again, interesting, thats all,
3/4 of the way down link, twin calipers nicely packed in there!





RE: Caliper placement re-birth
RE: Caliper placement re-birth
it's not clear to me what's meant by that. if you're suggesting it's added inertia, then why is it important whether it's in front or behind?
RE: Caliper placement re-birth
I still mount our calipers to the front on both the Lotus Cortina and Mini Cooper race cars. On the Mini that's the only way they will fit and still have sufficient clearance for steering bits.
Rod
RE: Caliper placement re-birth
It seemed to me that the intertial vector of any excess mass in front of the steering axis would add to the disturbing force whereas the inertial of any excess mass aft of the steering axis would add to the restoring force.
Or so I reasoned out in analogy to the mass balance effect of aerodynamic control surfaces. I don't claim any of this is factual; this is something I recall reading in excess of 45 years ago... And, I don't claim to understand it now much less then.
RE: Caliper placement re-birth
"Front" mounting a caliper with that steering geometry generally places it at a greater distance/larger radius from the pivot, compared to rear mounting. The result is greater inertia, and a somewhat lower natural frequency (resonance)for basic wobble type steering mis-behaviour phenomena. It seems unlikely to me that the change could be enough to move the resonant frequency above operating speed. But whether by fashion or for genuine function race bikes use rear mounting a lot.
http://www
RE: Caliper placement re-birth
Mounting the brakes, dual discs as example, to the rear makes sense if for no other reason than the wheel/caliper wt ratio. On most of the later Japanese bikes I have owned, the dual front discs were rear mounted...don't think I've ever seen it any other way. On the race cars, in my case, the Lotus Cortina (the Mini Cooper is a separate case as the brakes can only be mounted in the front because of steering issues), the overall mass of the wheel/tire make the placement of the rather light wt calipers... or at least the overall effect to steering/handling of the race car, rather moot.
Rod
RE: Caliper placement re-birth
These guys from new Hampshire mounted the caliper forward of the fork leg back in 1973.
ht
RE: Caliper placement re-birth
Look closely at his left boot...no gear change. Wanna know why?
Rod
RE: Caliper placement re-birth
Those cast wheels didn't work out too well off road either.
RE: Caliper placement re-birth
=================
For one brief shining moment the belt drive, cast wheels and caliper placement were not insurmountable impediments to good finishes at a significant off road event.
48th International Six Days Trial (1973)
Dalton, Massachusetts, USA
picture of ROKON team in Dalton woth a few cast wheels here -
http:/
1973 ISDT results - American riders only
350cc class: 27 riders
6th Jack Penton(240) Penton Gold
12th Ron Bohn(229) Husqvarna Silver
13th Gary Snider(236) Rokon Silver
14th Carl Berggren(225) Lind-Qvarna Bronze
15th Jim Fogle(232) Rokon Bronze
17th Ron LaMastus(223) Rokon Bronze
18th Jim Simmons(244) Rokon Bronze
RE: Caliper placement re-birth
RE: Caliper placement re-birth