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Frame geometry

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Old 05-15-11 | 08:09 PM
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Frame geometry

Hello everyone. Please help me understand this a bit - is it the lower the degree numbers the more relaxed geometry regarding seat tube and head tube angles. Example, a ST and HT angle of 72 degreed is more relaxed than a ST and HT of 73.5 degrees (same frame sizes)? Is there that mch difference in handling and feel between these numbers?

Reason I ask, I am looking at a couple single speed road bikes, both 58cm. One of them is labeled as a track bike, but it has the 72 degree HT and ST angles, while the other is labeled a road single speed and has 73 and 73.5 HT and ST angles. I would the track bike would have steeper angles than the road bike, no? Perhaps just manufacturer specs and the "track/road" labeling really has nothing to do with it? Thanks.w
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Old 05-15-11 | 08:37 PM
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Head and seat tube angles are measured up from the horizontal, so 90° means vertical and bigger numbers mean steeper (closer to vertical) than smaller values.
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Old 05-15-11 | 09:18 PM
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Originally Posted by bfloyd6969
Reason I ask, I am looking at a couple single speed road bikes, both 58cm. One of them is labeled as a track bike, but it has the 72 degree HT and ST angles, while the other is labeled a road single speed and has 73 and 73.5 HT and ST angles. I would the track bike would have steeper angles than the road bike, no? Perhaps just manufacturer specs and the "track/road" labeling really has nothing to do with it? Thanks.w
Seems odd; I was under the impression track frames generally had twitchier geometry myself. 72° is kinda slack.
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Old 05-15-11 | 09:50 PM
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There won't be a lot of difference.
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Old 05-15-11 | 10:17 PM
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Originally Posted by Kimmo
Seems odd; I was under the impression track frames generally had twitchier geometry myself. 72° is kinda slack.
Thanks for the replies everyone. Yeah, I thought it was odd too. This is the bike in question:

https://gravitybikes.com/specialty/attack.html

Seems pretty relaxed for a so called Track bike, but then just because they call it "Track" surely doesn't mean so. I mean, it comes with brakes so it surely isn't a track bike. However, I am not wanting a track bike, just wanting a single speed freewheel for road riding so the laxed geometry is fine with me
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