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#1
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Brooks seat rail diameter changed in 70's ?
On Wed, 25 May 2005 21:37:25 GMT, Bob wrote:
Did the diameter of brooks seats rails change some time in the late 60's or early 70's ? My 1973 B-something-or-other (probably B15) measures 0.267". My 1989 Team Pro measures 0.274". I have a B5N from sometime in-between that measures 0.270". I don't have anything earlier than that to compare. GB |
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#2
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"Bob" wrote: I plan to pull another '73 Brooks saddle off another bike that also has and SR Laprade and do some swapping but before I spend a lot of time on that, is this a known issue ? All my saddles were sliding backwards in my SR Laprade post. I finally got a different seat post. Art Harris |
#3
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I've got a B17 from the 60's and a current model. The rails on the
newer one are a few thousandths larger but nothing that should be an issue with a seat pin clamp. At least, not my old steel Campy. But, yes, the clamp sizes on posts can vary quite a bit. And, you can always shim it if looks don't count. D.M. paradise = lugged steel bikes and wooden boats |
#4
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In article ,
"Arthur Harris" wrote: "Bob" wrote: I plan to pull another '73 Brooks saddle off another bike that also has and SR Laprade and do some swapping but before I spend a lot of time on that, is this a known issue ? All my saddles were sliding backwards in my SR Laprade post. I finally got a different seat post. That SR Laprade saddle post! What is their story? I have one and a Brooks Proffessional saddle ( about 15 years old and the plating on the saddle rails is like new). The saddle kept slipping back. The saddle rails are large enough, or the saddle post clamps small enough to engage each other, but it seems that the saddle rails are so hard and slick that the friction design fails. I asked a mechanic at the lbs and he put a wrench on the hold down bolt, then tightened it very hard. Result was that the saddle continued to slip back, _and_ the threads in the alloy of the SR Laprade saddle post clamp were warped. By warped I mean that even when the saddle post assembly was not tightened down, the bolt did not turn freely in the alloy threads. Blegh! I took the two elements of the saddle post clamp, layed them out with their clamping surfaces up, mixed up some JB Weld, and made four pads of JB Weld on each of the two elements of the saddle post clamp. After 24 hours to cure I installed the saddle with the modified clamps, took a ride, and the saddle remained in place; no slipping. Another testimonial to JB Weld; it truly is better than baling wire. All hail JB Weld! Now for the warped threads. Took the saddle post bolt to the hardware store, bought a nut that fits it, bought the same kind of bolt that is one nut longer than the original, drilled out the threads in the alloy clamp piece, glued the nut to the clamp piece, and reassembled the saddle post with the new bolt. The bolt spins like a top in the steel threads of the bolt, I can tighten the bolt as hard as I please without worrying that the threads in the aluminum alloy will strip, and the saddle stays where I put it. (When gluing the nut to the clamp element take care that glue does not flow into the threads.) For the new bicycle I got a Brooks saddle and the Salsa saddle post. Love that Salsa! The indepent micro-adjustable saddle tilt is a treat. The saddle does not slip in the clamp. A question. How hard can I tighten bolts in my aluminum allow stem? I do not tighten nearly as hard as I would like, and worry that I will strip the;, then have to replace the stem, or find a clever way to fix it. I do not trust threads in aluminum alloy, even though my automobile mechanic says that he does and I could. -- Michael Press |
#5
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Michael Press wrote:
[Laprade tale o' woe snipped] Curious. I've had one for more than 20 years, with an assortment of Brooks saddles fitted thereto, and nary a promble. -- Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/ While you were out at the Rollright Stones, I came and set fire to your Shed. |
#6
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"Arthur Harris" writes:
All my saddles were sliding backwards in my SR Laprade post. I finally got a different seat post. I wonder if coating the rails with something for the clamp to "bit into" and something that will "compress and hold the saddle" would work ?? for example, wrap the saddle rails with sticky bar tape (do not overlap the tape, wrap a 3" length and line up the tape side-side to keep it flat. Since bar tape is essentially the same as sports tape - used by wide receivers to catch balls in football - i have a feeling that this might "catch" the brooks saddle in place and stop it from moving. - Don Gillies San Diego, CA |
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