Frame Geometry Registry
02-04-18, 03:58 PM
#1
Lapped 3x
Thread Starter
Frame Geometry Registry
So the last 6 months or so, I think we've had more than the usual number of frame and fit questions. I think it's great that we have new riders looking to buy bikes, and established riders looking for new rides to dial in their gear and eke out every last bit of performance from their bodies that they can.
Much like we had the Wheel Review thread so that people can reference what's out there, I was thinking of doing the same thing for frames. If you have a link to or know of some useful information regarding certain frames, please post here. It will make it so much easier for anyone looking to answer the "I'm X tall and have a hard time finding frames that fit", or at least give them a little information so that they can better frame their questions as to what they are looking for.
I'll edit the Opening Post as info comes in and try and group frames according to Longer TT frames, Shorter TT frames, Longest TTs for big riders, and Shortest TT for small riders.
Edit: It's not allowing me to format things the way I want. Post your info and I'll pop them into a spreadsheet and turn them into images and post them.
Look
Fuji
Track Elite
Avanti
Pista Team
Pista Pursuit
Much like we had the Wheel Review thread so that people can reference what's out there, I was thinking of doing the same thing for frames. If you have a link to or know of some useful information regarding certain frames, please post here. It will make it so much easier for anyone looking to answer the "I'm X tall and have a hard time finding frames that fit", or at least give them a little information so that they can better frame their questions as to what they are looking for.
I'll edit the Opening Post as info comes in and try and group frames according to Longer TT frames, Shorter TT frames, Longest TTs for big riders, and Shortest TT for small riders.
Edit: It's not allowing me to format things the way I want. Post your info and I'll pop them into a spreadsheet and turn them into images and post them.
Look
Fuji
Track Elite
Avanti
Pista Team
Pista Pursuit
Last edited by taras0000; 02-04-18 at 06:05 PM.
02-04-18, 04:03 PM
#2
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Documenting TT numbers is only going to be useful if the seat tube angle is referenced. A 52cm TT with a 75° STA is a longer reach than 54cm TT on a 73° STA. Lot's of small bikes "lie" with deceptively steep STAs.
02-04-18, 04:28 PM
#3
Senior Member
Personally the horizontal distance from BB to top of the HT (reach) is more important than TT length. STA does not affect reach but the HTA will affect reach.
Last edited by 700wheel; 02-04-18 at 04:44 PM.
02-04-18, 04:44 PM
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Reach is dependant on head tube height, so it can't be used on its own to determine relative reach. Measuring between a vertical line and a converging line through the headtube is of really limited use.
02-04-18, 05:37 PM
#5
Senior Member
Yes but no.... Reach is taken horizontally from the BB to the top of the head tube at the centre of the steerer. You can then look at the head tube angle if you want to get more specific, but the reach and stack dimensions are the absolute best ways to compare frames to each other. Essentially, after you are correctly fitted, your saddle position is fixed for height and setback. If you want longer, you need a frame with more distance to the bars i.e. reach, or shorter being the opposite. If you want a higher handlebar setup, higher stack, or lower stack for the opposite.
02-04-18, 05:46 PM
#6
Senior Member
Track bikes - Duratec
Not fancy pants carbon, but these guys have totally changed they way I thought about alloy (possibly in much the same way Tiemeyer did for others). My bike handles awesomely on the boards and rides the black like on a rail. I don't have to fight it at all and the thing is solid as a rock, which is especially awesome as it's a custom 63cm TT!
Not fancy pants carbon, but these guys have totally changed they way I thought about alloy (possibly in much the same way Tiemeyer did for others). My bike handles awesomely on the boards and rides the black like on a rail. I don't have to fight it at all and the thing is solid as a rock, which is especially awesome as it's a custom 63cm TT!
02-04-18, 05:49 PM
#7
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Yes but no.... Reach is taken horizontally from the BB to the top of the head tube at the centre of the steerer. You can then look at the head tube angle if you want to get more specific, but the reach and stack dimensions are the absolute best ways to compare frames to each other. Essentially, after you are correctly fitted, your saddle position is fixed for height and setback. If you want longer, you need a frame with more distance to the bars i.e. reach, or shorter being the opposite. If you want a higher handlebar setup, higher stack, or lower stack for the opposite.
If I buy a frame with a particular Reach and install 30mm of spacers, is the reach the same as with no spacers?
Reach, as defined, is only useful if you are going to use the bike with no rise, or if you are comparing bikes with the same stack. Outside of that it is useless number that makes short head tube frames appear to have long reach, since they don't account for the increased set back of the angled seat tube.
02-04-18, 06:05 PM
#8
Elitist
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I wouldn't expect the data in this thread to be exact to the millimeter. I think its usefulness will come by getting people in the ballpark as well as providing measurements (albeit provided by the manufacturer) for the sake of comparison.
02-04-18, 06:08 PM
#9
Lapped 3x
Thread Starter
Dolan
TC1
Precursa
FXE
Seta
DF4
Forza
DF3
TC1
Precursa
FXE
Seta
DF4
Forza
DF3
Last edited by taras0000; 02-04-18 at 06:12 PM.
02-04-18, 06:23 PM
#11
Lapped 3x
Thread Starter
You can post links to manufacturer webpages if there is a geo spec. I'll post it up.
02-04-18, 08:18 PM
#19
Senior Member
If a 56cm frame with 140mm headtube has the same Reach as a 50cm frame with a 100mm headtube, do they actually have the same useful reach?
If I buy a frame with a particular Reach and install 30mm of spacers, is the reach the same as with no spacers?
Reach, as defined, is only useful if you are going to use the bike with no rise, or if you are comparing bikes with the same stack. Outside of that it is useless number that makes short head tube frames appear to have long reach, since they don't account for the increased set back of the angled seat tube.
If I buy a frame with a particular Reach and install 30mm of spacers, is the reach the same as with no spacers?
Reach, as defined, is only useful if you are going to use the bike with no rise, or if you are comparing bikes with the same stack. Outside of that it is useless number that makes short head tube frames appear to have long reach, since they don't account for the increased set back of the angled seat tube.
02-04-18, 08:41 PM
#20
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But TT lengths are useful regardless of the head tube height. You can tell immediately if two bikes have similar reach even if you'll be using spacers on one and not the other. To do the same with S/R numbers you have to subract 3mm of reach for every additional 10mm of stack.
02-04-18, 08:48 PM
#21
Senior Member
https://www.ridley-bikes.com/project...-vision-track/
Ridley Arena-alloy -vision
https://www.ridley-bikes.com/project...-vision-track/[QUOTE]
Here is the geometry for the Ridley Oval just in case anyone finds one for sale:
Attachment 598207
Last edited by 700wheel; 02-04-18 at 09:14 PM.
02-04-18, 09:17 PM
#22
Senior Member
Blue Lehigh Geometry
Blue Competition Cycles-TRACK
Pinarello (two track bikes)
https://www.pinarello.com/en/bike-2016/track/maat-60.1
Bianchi
https://www.bianchiusa.com/bikes/track/
Blue Competition Cycles-TRACK
Pinarello (two track bikes)
https://www.pinarello.com/en/bike-2016/track/maat-60.1
Bianchi
https://www.bianchiusa.com/bikes/track/
Last edited by 700wheel; 02-04-18 at 09:24 PM.
02-04-18, 11:38 PM
#23
Lapped 3x
Thread Starter
Bike Technologies (BT)
I don't have access to all the numbers, but these are the general numbers I can come across. I'll fill in more as I get more.
Stealth 55cm
Geometry:
Top tube - 57cm
Head tube - 90mm
Seat Tube angle - 74deg
Head Tube angle - 74deg
Sprint fork rake - 37mm
Pursuit fork rake - 40mm
BB Drop - 45mm
I don't have access to all the numbers, but these are the general numbers I can come across. I'll fill in more as I get more.
Stealth 55cm
Geometry:
Top tube - 57cm
Head tube - 90mm
Seat Tube angle - 74deg
Head Tube angle - 74deg
Sprint fork rake - 37mm
Pursuit fork rake - 40mm
BB Drop - 45mm
Last edited by taras0000; 02-08-18 at 07:33 PM.
02-04-18, 11:54 PM
#25
Lapped 3x
Thread Starter
Ridley
Arena Carbon Vision
Ridley Arena-alloy -vision
Here is the geometry for the Ridley Oval just in case anyone finds one for sale:
Attachment 598207