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Top Tube Noob Question

Old 06-19-14, 02:20 PM
  #1  
crad159
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Top Tube Noob Question

What are the affects of having a top tube that is more angled than a flat top tube?
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Old 06-19-14, 02:27 PM
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Originally Posted by crad159 View Post
What are the affects of having a top tube that is more angled than a flat top tube?
Manufacturers will tell you that it has comfort/performance benefits, but the real reason they do it is to have fewer frame sizes fitting more riders with less cost.
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Old 06-19-14, 02:31 PM
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So you can look like a pro
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Old 06-19-14, 02:35 PM
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It fixes standover height problems for more people.
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Old 06-19-14, 10:58 PM
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It depends on frame size and material, some combinations of which it can allow for smaller, tighter triangles, and thusly, a stiffer, better handling bike. It also makes for less material in the frame, both absolutely (shorter tubes) and by design (tubes can be lighter construction because the rigidity is part of geometry), making a lighter, more responsive bike.

Giant brought compact geometry mainstream, and the biz has not looked back for about 20 years now.
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Old 06-20-14, 02:11 AM
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You get more standover clearance. Everything else is a moot point - there are stiff, light, comfortable frames with all kinds of top tube angles and shapes, from dead level to very angled, both straight and curved.
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Old 06-20-14, 05:06 AM
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Originally Posted by crad159 View Post
What are the affects of having a top tube that is more angled than a flat top tube?
Correct.
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Old 06-20-14, 06:07 AM
  #8  
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They didn't do sloping much BITD cuz it would likely mean having a few different seat lugs to cover a size range. TIG'd frames meant lugs don't matter any more. MTBs were mostly sloping by 1991. Dunno when roadies got to be mostly sloping. 1999ish?

Edit: I guess you'd need a variety of top head lugs for sloping lugged frames, also.

Last edited by LesterOfPuppets; 06-20-14 at 08:13 AM.
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Old 06-20-14, 06:17 AM
  #9  
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For a given wheelbase, crank position,handlebar position, a slanted top tube can do a few things:

1. Shorter seat stays
2. Sorter top tube
3. Longer head tube

What effect these have for a given saddle position is for further discussion.
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