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#1
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When Is Standover Height Insufficient?
"Steve Sr." wrote:
I had a professional fitting done to in anticipation of ordering a custom geometry bike. With the fitting I found out that I had a short torso and arms which requires a geometry with a high front end and relatively shorter top tube. The fitting was done on a Serotta Size Cycle but the frame was done by another manufacturer. The frame builder addressed these issues with a longer seat tube and a slightly sloping (up) top tube and a taller head tube. Unfortunately in dealing with these issues it appears that the stand over height was missed by about 3/4" i.e. the bike is about 3/4" higher than was recommended by the fitting. I think you might have been better off with a stock frame. Modern frames tend to have longish top tubes for a given seat tube size. So if you had chosen a stock frame with an appropriately short top tube, you would have had plenty of standover. A rising stem and/or a long steer tube (if a threadless h/s) would have allowed you to get the bars up high enough. What does the custom builder say? He's the one who "missed" the target standover height by 3/4". And with a sloping top tube and extended head tube at that! So far I have had a test fitting on the new bike but haven't been able to ride it since the seat post provided was too long (won't go low enough). I can just barely straddle the bar with bike shoes on. I would estimate that there is currently somewhere 0-1/4" clearance if I stand just right. The bike currently has 23mm tires on it but I will probably switch to 25mm when these wear out to reduce the chance for flats. This will only make the stand over height worse. Is this stand over height likely to be an issue? At what point would you consider stand over height to be insufficient? I happen to like large frames, and my bikes have less standover clearance that most. But I still like to have at least 1-2 cm of clearance. The only time it's a issue is when you're stopped at a traffic light, or when you're "waiting up" on a group ride. But there definitely are times where I straddle the frame with both feet on the ground. I wouldn't want a bike with zero clearance, especially if I paid for a custom frame. If you provided the frame builder a list of requirements that included a particular standover height, then I would make him take the frame back. I assume the too long seat post is a Thomson set back model which needs about 10cm (minimum) of exposed post. The fact that you need less seat post exposed is another indication that the frame is too big. Just out of curiosity, how high are you trying to get the bars relative to the saddle? Unless you're trying to get the bars considerably higher than the saddle, there shouldn't have been a problem. Hope you can work this out, but don't accept a bike that you're not happy with. Art Harris |
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#2
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When Is Standover Height Insufficient?
On Sun, 31 Jul 2005 18:32:56 -0400, "Arthur Harris"
wrote: I happen to like large frames, and my bikes have less standover clearance that most. But I still like to have at least 1-2 cm of clearance. The only time it's a issue is when you're stopped at a traffic light, or when you're "waiting up" on a group ride. But there definitely are times where I straddle the frame with both feet on the ground. When I'm stopped at a light, I have my ass on the seat, one foot on a pedal (usually the left), the bike tilted, and the other foot on the ground. Usually works for me. Jasper |
#3
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When Is Standover Height Insufficient?
Steve Sr. wrote:
I looked at stock frames and the common issue was that if I got the top tube correct the seat tube would be too short making the front end too low once the seat was raised to the proper height. "Compact" frames are very common these days. There is really no direct relationship between seat tube length and handlebar height (or head tube length). Some have a top tube that slopes at a greater angle than others... or in other words your bars will end up higher for a given seat tube length. Giant and Specialized come to mind; also some models of Litespeed-Merlin, Airborne Torch, or Habanero Custom. I'm pretty certain that you could have found a stock frame that fit you well, or you could have had a custom frame made that had a much shorter seat tube, giving you plenty of clearance. Personally, I think that a sloping top tube is visually appealing if you are angling the stem up anyway.... and you already have a 410mm Thompson post! I hope you get it sorted out to your satisfaction. You should be 100% happy with a custom frame, but I don't know how much of your own input (or lack thereof) may have contributed to the final product. -Ron |
#4
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When Is Standover Height Insufficient?
Steve Sr. wrote:
I did question the builder about standover height when I saw a 60cm seat tube on the approval drawing. I thought this seemed kind of large considering I wear 29-30" inseam trousers. Yep, that should have been a red flag. The top of the bars is supposed to be about even with the seat. The steerer is carbon which limits the amount of spacers. The stem is a standard 10 degree road stem flipped up. Better options might have been: A longer (steel) steer tube, a stem with more rise, and/or a top tube with more slope. You started off with the problem that frames with the right (short) top tube length for you gave too much standover and too much drop from the saddle to the bar. And you ended up with with a frame with proper bar height and reach, but zero standover clearance. I still think you could have found a stock frame that would have worked. If you had gone to a frame with a slightly longer top tube (1 or 2 cm longer) and made up the difference with a shorter stem, you probably could have worked out the position of the bars and saddle. A stem length of 80 or 90 mm wouldn't compromise handling. Art Harris |
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