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#1
02-15-2007, 01:18 PM
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Frame geometry question
What kind of ride would this geometry produce?
* Seat tube: 60cm c-c * Top tube: 58.5cm c-c * Head angle: 73.0 degrees * Seat angle: 73.0 degrees * BB drop: 8.0cm * Chainstay: 41.0cm * Fork offset: 41mm 
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#2
02-15-2007, 01:39 PM
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just a guess
but with a 41 rake and 73 HTA that should have more trail=more stable and also the BB drop of 8 vice 7 means not designed for hard cornering (you'd catch a pedal)
the chainstays are longer than some more race-designed machines that use 40.2-40.5. you probably want to know the wheelbase and front center distance and HT length too--a large HT might put you in a more upright position for comfort so i am guessing overall it is a good stable ride? is this a test?--if you include the make/model many manufacturers usually have a design in mind for intended use and that will tell you something about ride
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#3
02-15-2007, 01:44 PM
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Quote:
Hi Vlad, I think I know what's going on here!! What stem length, and crank length do you ride? Do you know your seat height - center of crank to top of saddle number? g
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#4
02-15-2007, 01:47 PM
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vlad, we need to know more. like what color.
JG Quote:
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#6
02-15-2007, 01:50 PM
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Quote:
__________________
A man with any character at all must have enemies and places he is not welcome—in the end we are not only defined by our friends, but also those aligned against us.
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#8
02-15-2007, 02:39 PM
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You're in the zone. I assume you've had 8cm bb drop with 180's before?
I have shrimpy 170's, and prefer 8cm for sure, but don't know how much of an issue, if any, the extra crank length might be. As Archie said, that's pretty std euro race geometry. Depending on what characteristics you like, another 'style' would be to stretch out the wheelbase a bit, and shrink the trail a bit. The longer wheelbase is more stable, and yet the less trail is zippy feeling. So you might end up at: 59 top tube 73.5 headtube 47mm rake 42cm chainstays Any builders out there have any thoughts??? g
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#9
02-15-2007, 02:39 PM
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Quote:
not
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#10
02-15-2007, 02:44 PM
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vlad, i'd probably prefer a longer stem
nothing in that geo is wack. looks like a sensible bike for a guy who doesn't have his bars real low and maybe has lost some reach flexibility. french fit level tt...maybe? guessing that the saddle setback from bb is 8-9cm?
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#11
02-15-2007, 02:45 PM
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Quote:
way too short for efficient use of a 10 cog cassette.
__________________
________________________ the tao of atmo the tao of e-RICHIE©™® ________________________ Campagnolo = The Journey Shimano = Mapquest
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#12
02-15-2007, 02:49 PM
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Quote:
as an aside a 45mm rake'll work better with a 73 degree head angle imho given the rest of the numbers you've got here. then again, i've never seen yu and hopefully your framebuilder knows what he's doing. 41cm stays sound a bit short for 8cm of drop..... my suspicion is also that a 60cm c-c bike built out of modern oversize tubes will probably sit too tall for someone with an 80cm saddle height....but i have no idea how much drop you want to run.... obtuse
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#13
02-15-2007, 02:50 PM
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dude- i can't even type it before you beat me to it..... obtuse
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#14
02-15-2007, 02:51 PM
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not a builder-but that wheelbase will be a bit on the whacked out stupid long side for a bike of that size. obtuse
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#15
02-15-2007, 03:13 PM
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Quote:
you said 41 is too short, and suggested 45 rake. I said 47 rake, 5mm more top tube, and haul it back in by increasing the head angle a bit. Colango's with their 71 head angles have longer front centers than what I just proposed. no? atmo?? g
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