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- From: v206gb6c@ubvmsb.cc.buffalo.edu (My stuffed shark is eating my toenail clippings)
- Newsgroups: rec.bicycles.tech
- Subject: Re: Suspension Questions
- Message-ID: <C19n6B.7CM@acsu.buffalo.edu>
- Date: 22 Jan 93 17:29:00 GMT
- References: <102510017@hpfcso.FC.HP.COM>
- Sender: nntp@acsu.buffalo.edu
- Organization: University at Buffalo
- Lines: 45
- News-Software: VAX/VMS VNEWS 1.41
- Nntp-Posting-Host: ubvmsb.cc.buffalo.edu
-
- In article <102510017@hpfcso.FC.HP.COM>, richd@hpfcso.FC.HP.COM (Rich Davis) writes...
- >
- > I recently purchased a Specialized M2. I decided to hold off on
- > suspension because of some questions I have. First off, is there
- > seems to be a couple of solutions for suspension that attempt to
- > accomplish the same result; front-end, and handle bar. I know a
- > lot of people riding fork suspension, they all say the same things,
- > ie; it alters the frame geometry, it adds weight, there's maintenance,
- > etc.... But they are still sold on the forks. Unfortunatley, no one
- > I know has ridden handle bar suspension.
- >
- > I'm curious to know if anyone has tried riding handle bar suspension,
- > and might be able to compare/contrast this with fork/frame solutions.
-
- There are 2 suspention stems that I know of: the Allsop Frankenstem;
- and the Girvin Flex-Stem. As soon as I log off, I'm going to order a
- Frankenstem. I had a Flex-Stem on my last mountian bike and I'm seriously
- thinking about getting one for my touring bike.
-
- The Flex-Stem pivots on a urethene bumper (elastomer, to the suspention
- fork crowd). You can chose from 3 densities of urethene (hard, medium, and
- soft). It works well for city street and gravel road riding, but not so
- well on single track. It is great for "high-frequency, low-amplitude" bumps.
- The main disadvantages are a low travel distance (can't do much for big
- bumps), and the geometry of the handle bars changes slightly downward
- during the shock absorbing pivot. There are a couple of versions of the
- stem. One is a cro-moly stem replacement ($55); and one is an aluminum
- stem replacement (@500 gr, $80). I know they have a stem and bar combo
- also, but I'm not sure its the Titanium bar and stem (Al?) combo listed in
- the Bike Pro add I have here (which all prices listed are from) ($220).
- A replacement bushing (bumper) kit is $20 and includes 4 bumpers.
-
- The Frankenstem is a different moster all together. It employs a spring
- suspended parallelagram that hold the handle bars at a constant pitch relative
- to the rider (no rotational pivot). It is supposed to have almost 3" of travel.
- And deal well with both high-freq low-amp and low-freq high-amp bumps. The
- design also prevents twisting of the handle bars (tortional?). There are both
- cro-moly (@740 gr, $148) and aluminum (@600 gr, $190) models. Apparently
- Team Ritchey rides these on some of there bikes (if that kind of stuff impresses
- you).
-
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