|reynolds ouzo pro spacers||ditcher|
Sep 13, 2002 5:55 PM
|I'm building a bike my lbs said not to put more than an inch of spacers on an carbon steering tube.I suppose I could gain some heigt by flipping the stem up though.Does anybody know the rules of carbon tubes. thanks ditcher|
Sep 14, 2002 5:19 AM
|2cm is the general rule for 1" steering tubes. I suppose you could go a little more on 1-1-/8" tubes.
I would never use that much. Increasing the stem rise will produce a more rigid setup.
If you flip an 11cm stem over (from 80 to 100 degrees) it will raise the bars about 3.5cm, but a 1cm longer length will be needed to produce approximately the same horizontal reach. Check out the site below for stem rise/length relationships.
My other suggestion is to work on abdominal and back strength is you can't handle an 8-10cm drop from the saddle to the top of the bars.
If you need 2cm of spacers or a high rise stem to get the bars up to 8cm below the the saddle, your LBS sold you a frame that's (vertically) too small.
|Reynolds says 31mm for 11/8th..n.m.||koala|
Sep 14, 2002 6:28 AM
|Are you sure? They told me 38mm for 11/8th...||PsyDoc|
Sep 14, 2002 11:14 AM
|...actually, they specifically told me not to exceed 3.81cm of spacers.|
|What Reynolds Instructions Say||cogmaster|
Sep 14, 2002 12:40 PM
|Reynolds instructions say 1.25". This is about 35mm of spacers...|
|Are you sure? They told me 38mm for 11/8th...||koala|
Sep 14, 2002 4:36 PM
|It was over a year ago i spoke with a rep, so maybe i got it wrong...|
|Are you sure? They told me 38mm for 11/8th...||cogmaster|
Sep 14, 2002 8:08 PM
|Positive, I just installed on of these 3 months ago and had the instruction sheet yet. This is for a 11/8" carbon.|
|38mm = 3.8 cm- love that metric system! -nm||SnowBlind|
Sep 16, 2002 9:53 AM
|re:depends on source||Rusty Coggs|
Sep 14, 2002 12:22 PM
|Another general rule from Schwab Cycles catalog. 2.5cm for 1", and 3.5 cm for 11/8"|
|of course, that far and the Stem Nazis would get you :) nm||weiwentg|
Sep 15, 2002 4:44 PM
|I've heard 2 cm as well||pmf1|
Sep 16, 2002 4:49 AM
|My LBS, which sells lots of high bikes and has good mechanics says not to exceed 2 cm on an all carbon fork. You can gain some rise by flipping a stem. Make sure you choose one that is not 90 degrees.|
Sep 16, 2002 11:27 AM
|I've run over 30 cm of spacers on 1" Ouzo carbon steerers before w/out any problems, but to quote Ray Davies of the Kinks, "I'm not the world's most physical guy." The rules are really based on statics and strengths of materials. You can do all sorts of anaylysis for a cantilevered cylinder, but there are a ton of assumptions you'll have to make. Ultimately a lot comes down to what you want to use as a factor of safety and you can bet that the fork manufacturers like to be well on the safe side. You'll be just fine. When was the last (or even the first time) you heard of anyone shearing off a carbon steerer on a Reynolds fork in anything less than a nasty wreck? It just doesn't happen. I'd be a lot more worried about those wimpy little 200 g. handle aluminum handle bars that we know are going to fatigue and fail in time.|
|30 cm of spacers!||pmf1|
Sep 17, 2002 4:05 AM
|You must mean 30 mm of spacers.
I agree with your comments on the fork. This seems to be a huge and unneeded concern here. For some reason people have this misperception that carbon is more failure prone than other materials. If the things broke so easily, no one would make them out of fear of being sued.
The only guy I recall breaking a carbon fork is Doug Sloan, and I think it was a Bianchi product.
Sep 17, 2002 8:17 AM
|I don't do meters and liters! 30 cm would look pretty dorky. It's all about liability and not wanting to get sued.|| |