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Frame Geometry ??? Tough question I think(5 posts)

Frame Geometry ??? Tough question I thinkmikebikr
Jan 16, 2002 10:38 AM
What differences do the following 2 frame geometries and size differences make if any? I realize the geometries are pretty similar. Assume everything else is equal. Components, wheels, stem, etc. Performance in sprinting, climbing, TT. How about comfort?

GEOMETRY BOTH BIKES ARE REYNOLDS STEEL 853

BIKE A57 BIKE B 57

TOP TUBE MM 57.5 57

HEAD ANGLE º 73.5 73.5

SEAT ANGLE º 72.5 73

FORK RAKE MM 43 40

CHAINSTAY LENGTH MM 415 415

WHEELBASE MM 1000 997


CRANK LENGTH MM 175 172.5


STEM LENGTH MM 120 120

STAND OVER HEIGHT MM 814 811

HEAD TUBE 151 155
Tough question.allervite
Jan 16, 2002 5:33 PM
These bikes are quite close. I think that probably the only thing you would really notice is that Bike B will corner better and be a little quicker handling. Bike A seems to be set up as a touring or road racing bike with the slacker geometry, longer rake and hill taming 175 cranks.
re: Frame Geometry ??? Tough question I thinkTrent in WA
Jan 16, 2002 9:25 PM
I'm far from being an expert, but there doesn't seem to be enough difference between the two bikes on paper to make a real difference in performance. Bike "A" is incrementally longer, but will probably have a slightly quicker front end because of the slightly greater fork rake. You might notice some difference with the cranks, but that's a toss-up. I'd ride both and see which one you like best.

Bike "A" is a LeMond, no? I have a 57cm Nevada City with an identical geometry, except I swapped the stem out for a shorter (10cm) one.

Trent
re: Frame Geometry ??? Tough question I thinkmikebikr
Jan 17, 2002 5:30 AM
Trent:

You are really good at this game. Yes bike A is a Lemond. The signature longer top tube is the giveaway there I guess.

Thanks for your input. I'm deciding between a Lemond Zurich and the Jamis Eclipse.

Mike
Agree, except that. . .allervite
Jan 17, 2002 2:04 PM
The more fork rake the slower the steering; and it is noticeably harder to spin 175's at a high cadence than 172.5's. Also with the same gearing, wheels etc. 175's are like noticeably easier to push on a steep hill than 172.5's. Some people may not be able to feel the difference between the two sizes, but most will.