CX Geometry: Head Tube/Seat Tube Angles - Cyclocross Magazine2024-03-29T13:08:25Zhttps://cowbell.cxmagazine.com/forum/topics/cx-geometry-head-tubeseat-tube?commentId=1198434%3AComment%3A70110&feed=yes&xn_auth=noWell, problem now is the supp…tag:cowbell.cxmagazine.com,2010-11-04:1198434:Comment:728072010-11-04T09:09:37.085Zsuphttps://cowbell.cxmagazine.com/profile/AlanSotelo
Well, problem now is the supply of tubes. I'll go for an aluminum frame for now.
Well, problem now is the supply of tubes. I'll go for an aluminum frame for now. I've decided on the HT/ST ang…tag:cowbell.cxmagazine.com,2010-10-20:1198434:Comment:709192010-10-20T00:50:39.643Zsuphttps://cowbell.cxmagazine.com/profile/AlanSotelo
I've decided on the HT/ST angles. Thanks for the inputs on the fork guys. Read up about it thru articles I found thru Google as well. Now to choose tubes and a fork. I'll still document the build in this topic, but it would take a while because of sourcing issues.
I've decided on the HT/ST angles. Thanks for the inputs on the fork guys. Read up about it thru articles I found thru Google as well. Now to choose tubes and a fork. I'll still document the build in this topic, but it would take a while because of sourcing issues. Alright guys, research it is…tag:cowbell.cxmagazine.com,2010-10-14:1198434:Comment:704422010-10-14T11:07:10.019Zsuphttps://cowbell.cxmagazine.com/profile/AlanSotelo
Alright guys, research it is for me! One thing's for sure, I would base my decision around the fork.
Alright guys, research it is for me! One thing's for sure, I would base my decision around the fork. Build around a 395 fork with…tag:cowbell.cxmagazine.com,2010-10-13:1198434:Comment:703922010-10-13T21:18:53.713ZKatsu Tandahttps://cowbell.cxmagazine.com/profile/KatsuTanda
Build around a 395 fork with 45mm rake. Pretty standard CX fork.<br />
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A 1 degree angle change will be noticeable.
Build around a 395 fork with 45mm rake. Pretty standard CX fork.<br />
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A 1 degree angle change will be noticeable. i'd avoid that 410mm fork - m…tag:cowbell.cxmagazine.com,2010-10-13:1198434:Comment:703902010-10-13T20:45:15.905ZCyclocross Magazinehttps://cowbell.cxmagazine.com/profile/cxm
i'd avoid that 410mm fork - most forks are 395 so if you don't like it it'll mess with the handling if you switch to another. i agree with kevin that i wouldn't have him experiment too much with geo if not a big cx builder - maybe base on a established builder - there are many advertising in the pages of cxm.<br />
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straight blade or raked has no effect on handling in terms of geometry, fyi - many folks get confused by that, maybe you knew that but don't let aesthetics confuse you. of course, a raked…
i'd avoid that 410mm fork - most forks are 395 so if you don't like it it'll mess with the handling if you switch to another. i agree with kevin that i wouldn't have him experiment too much with geo if not a big cx builder - maybe base on a established builder - there are many advertising in the pages of cxm.<br />
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straight blade or raked has no effect on handling in terms of geometry, fyi - many folks get confused by that, maybe you knew that but don't let aesthetics confuse you. of course, a raked forked might absorb more vibration, etc. if built a certain way, but that's a lot more subtle.<br />
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ALL THIS BEING SAID, i've swapped all kinds of forks on my bikes and ridden and race them and have never felt I lost a race or place because of my fork. but if doing custom you might as well try to do the homework beforehand. Yes, I'm having a frame build…tag:cowbell.cxmagazine.com,2010-10-13:1198434:Comment:703652010-10-13T06:53:33.835Zsuphttps://cowbell.cxmagazine.com/profile/AlanSotelo
Yes, I'm having a frame builder do it for me. Thing is, he's used to making road bikes. By the way, I'm not from the U.S. and cyclocross is relatively unknown here.
Yes, I'm having a frame builder do it for me. Thing is, he's used to making road bikes. By the way, I'm not from the U.S. and cyclocross is relatively unknown here. Are you having someone build…tag:cowbell.cxmagazine.com,2010-10-13:1198434:Comment:703622010-10-13T04:43:49.771ZKevin J. Ruschhttps://cowbell.cxmagazine.com/profile/KevinJRusch
Are you having someone build the frame for you or are you building it yourself? I think that you're best off leaving geometry to the pros - buy a frame from someone who has made a bunch of CX bikes and leave the design to them. Also, as was noted previously, the frame and fork have to operate as a unit so the builder will be able to make a good recommendation. Just my two cents...
Are you having someone build the frame for you or are you building it yourself? I think that you're best off leaving geometry to the pros - buy a frame from someone who has made a bunch of CX bikes and leave the design to them. Also, as was noted previously, the frame and fork have to operate as a unit so the builder will be able to make a good recommendation. Just my two cents... Helpful tips, c-note! Now thi…tag:cowbell.cxmagazine.com,2010-10-11:1198434:Comment:701412010-10-11T02:35:21.205Zsuphttps://cowbell.cxmagazine.com/profile/AlanSotelo
Helpful tips, c-note! Now this may be the reason why size 49's from some manufacturers have a slacker head tube angle.<br />
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I dug up the geometry of my road bike and the HT and ST angles are 71.5 and 73.5 respectively. The fixed gear I'm using is a 72/74. The thing I noticed between both is that the fixed gear has no toe overlap. I didn't take into account the fork rake because I don't know what they are. They seem to be the same. Anyway, I can't really compare both because of the BB drop which…
Helpful tips, c-note! Now this may be the reason why size 49's from some manufacturers have a slacker head tube angle.<br />
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I dug up the geometry of my road bike and the HT and ST angles are 71.5 and 73.5 respectively. The fixed gear I'm using is a 72/74. The thing I noticed between both is that the fixed gear has no toe overlap. I didn't take into account the fork rake because I don't know what they are. They seem to be the same. Anyway, I can't really compare both because of the BB drop which would also affect toe overlap (I think). The slacker HT angle of 71 wi…tag:cowbell.cxmagazine.com,2010-10-10:1198434:Comment:701102010-10-10T19:28:53.723Zc-notehttps://cowbell.cxmagazine.com/profile/cnote
The slacker HT angle of 71 will slow handling compared to a steeper angle given the same fork rake. It will have the effect of increasing the trail, making the bike more stable at speed, but perhaps producing wheel flop at slow speeds. You can increased the fork rake with the slacker HT angle to reduce the trail. The steerering will still be slower than the steeper HT despite the reduced trail. Old school mountain bikes often had 71 degree HT angles with lots of rake.<br />
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If your frame is small…
The slacker HT angle of 71 will slow handling compared to a steeper angle given the same fork rake. It will have the effect of increasing the trail, making the bike more stable at speed, but perhaps producing wheel flop at slow speeds. You can increased the fork rake with the slacker HT angle to reduce the trail. The steerering will still be slower than the steeper HT despite the reduced trail. Old school mountain bikes often had 71 degree HT angles with lots of rake.<br />
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If your frame is small and you need pedal/toe clearance, the slackened HT is the solution most often used. Recall, this was the case for small framed 700C wheeled bikes, and it produced adequate but somewhat quirky handling. The change to 650 C wheels made all the difference in the small frames, as the geometry could be "normalized". Some builders used only the 650 front wheel, but that created some issues with 2 tube and tire sizes. Thanks for the quick reply. I…tag:cowbell.cxmagazine.com,2010-10-10:1198434:Comment:700982010-10-10T15:22:44.010Zsuphttps://cowbell.cxmagazine.com/profile/AlanSotelo
Thanks for the quick reply. I haven't really thought about the fork that much. I'd definitely get a steel fork to keep the cost down. What's readilly available at the local shops is a 410 mm axle to crown aluminum fork, but that will be my last resort. If I get the aluminum fork, the result will be a slacker geometry. Straight blade or raked - I haven't decided yet. Anyway, I'm still in the planning stage so any input is greatly appreciated.<br></br>
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I'm going for Deddaciai Tre Zero tubing,…
Thanks for the quick reply. I haven't really thought about the fork that much. I'd definitely get a steel fork to keep the cost down. What's readilly available at the local shops is a 410 mm axle to crown aluminum fork, but that will be my last resort. If I get the aluminum fork, the result will be a slacker geometry. Straight blade or raked - I haven't decided yet. Anyway, I'm still in the planning stage so any input is greatly appreciated.<br/>
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I'm going for Deddaciai Tre Zero tubing, but the frame builder is still waiting for supply. If I can't control my itch, I'll be ordering Columbus tubing from Nova Cycles. It will be brazed. As far as documenting, there are some local articles about the frame builder. Contributing for the mag would be cool! I'll stick to posting here first 'coz I'm new to cross.