What do you think of this geometry?
12-16-08, 04:05 PM
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well you flipped it. looks pretty good. i would need a higher spoke count at my weight. im only joking because i only understand inches. haha
12-16-08, 04:06 PM
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chain stays are to long, seat needs to go up about 4cm, or back is to big for someone . 9cm stem on a 56.3 top tube
12-16-08, 04:19 PM
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Erik, did you draw this on an Auto CAD machine (or something similar)?
12-16-08, 04:27 PM
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Well it doesn't come close to fitting me properly so its back to the drawing board for you.
Seriously now its hard to know what to make of it because we don't know the size of the person you are trying to fit. One thing I did notice is that assuming this is a custom frame and you have worked out the contact points and they are correct then the stem is too short and the top tube is too long. Theoretically its ideal for a vertical line running up from the front hub to line up with the centre of the vertical section (as it goes around the curve) of the drop bar. The levers ideally should be all forward of this line.
Anthony
Seriously now its hard to know what to make of it because we don't know the size of the person you are trying to fit. One thing I did notice is that assuming this is a custom frame and you have worked out the contact points and they are correct then the stem is too short and the top tube is too long. Theoretically its ideal for a vertical line running up from the front hub to line up with the centre of the vertical section (as it goes around the curve) of the drop bar. The levers ideally should be all forward of this line.
Anthony
12-16-08, 04:37 PM
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Well it doesn't come close to fitting me properly so its back to the drawing board for you.
Seriously now its hard to know what to make of it because we don't know the size of the person you are trying to fit. One thing I did notice is that assuming this is a custom frame and you have worked out the contact points and they are correct then the stem is too short and the top tube is too long. Theoretically its ideal for a vertical line running up from the front hub to line up with the centre of the vertical section (as it goes around the curve) of the drop bar. The levers ideally should be all forward of this line.
Anthony
Seriously now its hard to know what to make of it because we don't know the size of the person you are trying to fit. One thing I did notice is that assuming this is a custom frame and you have worked out the contact points and they are correct then the stem is too short and the top tube is too long. Theoretically its ideal for a vertical line running up from the front hub to line up with the centre of the vertical section (as it goes around the curve) of the drop bar. The levers ideally should be all forward of this line.
Anthony
2: Not sure I agree, in fact it's actually on the short side, if one believes the online fit calculators.
The drawing is not to scale. The levers will be forward of this theoretical line.
Last edited by Erik B; 12-16-08 at 04:46 PM.
12-16-08, 04:43 PM
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Anthony
12-16-08, 04:44 PM
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12-16-08, 05:10 PM
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Well this is a problem. There is NO point trying to draw up a custom frame if your not sure what your correct size is. My opinion was based on assuming that the geometry and the saddle to bar distance was correct. If it is then you need to shorten the top tube and lengthen the stem to achieve the SAME saddle to bar distance. If this distance isn't correct in the first place then you need to go away and work out what the correct distance is first.
Anthony
Anthony
Would put every person with the same dimensions on the same exact cockpit, regardless of flexibility and the intended use?
12-16-08, 05:18 PM
#17
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I would never design a bike to use a stubby 90mm stem or have the bars up that high, but if it's a comfort touring bike and you don't want any toe overlap, I guess it's OK.
12-16-08, 05:19 PM
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Until you work it out we can't do anything for you.
Anthony
12-16-08, 05:37 PM
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I said the stem was a bit short,and the head tube a little long, and that some online calculators would put the riders morphology on a longer toptube. Others calculators would not.
To go back to an earlier comment.
75 and 178
To go back to an earlier comment.
75 and 178
Last edited by Erik B; 12-16-08 at 05:50 PM.
12-16-08, 05:45 PM
#20
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No one should EVER have a custom frame built, based on any type of online fit calculator. Even a professional fitting is very risky. Custom frames should be ordered by people who have ridden a stock frame for years and know for a fact what they want to be different. Those people will be satisfied when the custom frame arrives.
Last edited by DaveSSS; 12-17-08 at 07:20 AM.
12-16-08, 06:11 PM
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No one should EVER have a custom frame built, based on any type of online fit calculator. Even a professional fitting is very risky. Custom frames should be ordered by people who have ridden a stock frame for years and know for a fact what they want to be different. Those people will be satisfied when the custom frame arrives.
12-17-08, 01:45 AM
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I agree with others that the chainstays are too long (by 5-10mm) - especially if it is Ti as it tends to be on the flexy side already. The top tube should be shortened by about 2cm and the stem length increased by 2cm. The BB drop is on the high side, but as long as you don't need extra pedal clearance for crits it should handle better on descents that way.
12-17-08, 01:54 AM
#25
i got nothing.
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it looks like it's made out of metal...
should be carbon...
should be carbon...
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