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01-04.-2004, 02:55 AM
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#1 |
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Re: Yes, Fox knows all abbouut QR slipping
In article <406ad21c$1_2@mk-nntp-2.news.uk.tiscali.com>,
Russ <nomail@nowhere.com> wrote: > So how does arguing that positioning the disc brake caliper shouldn't be > positioned differently sit with doing your best to reduce the risks then - > because it clearly would do just that? Moving the caliper to the front of the fork leg would expose it to more risk of impact damage. That may, or may not, improve overall safety. It would certainly expose the point at which the brake line enters the caliper to more damage. That too may, or may not, improve overall safety. You're assuming that things you believe caused your accident can be changed in a manner which makes your accident less likely, but does not make other accidents any more likely. That may be possible. It may not be. ian |
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01-04.-2004, 10:38 AM
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#2 |
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Guest
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Re: Yes, Fox knows all abbouut QR slipping
In article <c4f4mg$2hqmq1$1@ID-178940.news.uni-berlin.de>,
Tony Raven <junk@raven-family.com> wrote: >Chris Phillipo wrote: > >> >> Since just about every trials guy knows that rear brakes have been >> tearing off of frames almost since the beginning because they are >> subjected to this "pulling" force when they hop on the rear wheel rather >> than the intended compression force. > > >Sorry Chris, you must be mistaken about that happening. Jobst has already >told us in no uncertain terms that there is nothing wrong with brake mountings >being in tension rather than compression. So what you claim is happening can't >have ;-) > >Tony > >PS Someone here a while ago mentioned that early trials motorbikes had tried >the caliper on the front but they had to give it up. Was I dreaming it or can >anyone shed any light on it? > Early trials motorcycles had drum brakes. Discs only became popular on trials bikes in the late 80s. Most trials bikes have the calipers on the front of the fork legs. Even my newest bike ('03 Scorpa) has the caliper on the front. It might be slightly less succeptible to damage and packing with mud there than mounted on the back of the fork leg, MTB style. But I have bikes that have their calipers mounted that way and I haven't damaged them or packed them with mud. Street/roadrace is different. When discs became popular on street motorcycles in the early 1970s most calipers were on the front of the fork legs. But putting them on the back puts the mass of the calipers closer to the steering axis (which is behind the forks). Early calipers were pretty heavy so moving them to the back of the fork legs made for quicker steering. Cafe racers (and real race bikes) in the 70's often had their fork legs reversed to obtain the desired position. All street and road bikes come with calipers mounted on the back of the fork legs now. But there's no other reason for motorcycle caliper position that I know of. Eric |
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