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WrenchScience measurement(7 posts)

WrenchScience measurement94Nole
Jul 19, 2002 5:03 PM
Is this a good measurement? Seems fairly thorough but then what do I know? I am 6' tall and it recommends a 60cm frame (center to top) or 58cm (center to center). Which frames measure which way? Seems I recall Trek being a center to center measurement? If I buy a used bike or from a website, doesn't seem to be that big of an issue to adjust the bike myself to fit me. Do I really need a LBS to do this?

This is a great board and I appreciate all I have learned here.
Take a test ride & find out..........jagiger
Jul 19, 2002 6:45 PM
I agree the RS measurement seems through, although from me I thought the reach was a little long when compared with my current bike. It'd be good to go to a few shops & see what seems to fit right. You would also get to check out the feel & handling of different bikes to the find ones that you might be interested in, as well as the price, service & etc that may make a LBS purchase more appealing to your. At a minimum you gain experience in addition to what you learn here. You'll end up with a bike that better meets your needs if you do a little work to find out more.
It may be correct, butJL
Jul 19, 2002 6:53 PM
my measurement (I'm 6' too) gave me a much smaller frame and a long stem. If you do a search from a few days ago, this same topic was discussed. Wrench Science tend to be on the short side. How did you get the "correct" size, since they don't go by actual height and rather many other factors? Like the other poster said try at an LBS before you buy. I ended up with a 58cm Trek 5200. I think they're Center to Top not C-C, but I could be wrong. I used the Wrench Science measurement (after I bought my bike) just to see what they would say was correct. Too me they seemed to use a shorter bike with a LONGER stem for the reach.

I would use WS as a guideline only and a decent LBS and a decent test ride (!) as the final determination.

Happy riding.

web site geometry charts...C-40
Jul 19, 2002 6:57 PM
Most brands have geometry charts on their websites. Some are better than others. Trek frames are about 2cm smaller than the advertised size. A 60cm would be about the same as a 58cm, measured center to top.

Lemond and LOOK both measure center to center. Center to top is more common.
Don't rely on their sizingcoonass
Jul 19, 2002 7:45 PM told me I needed a 50cm frame w/60cm top custom frames are 55cm c/c; 55cm tt and fit like a glove.......
re: WrenchScience measurementrengaracchi
Jul 20, 2002 12:26 AM
This is difficult to say. I used to ride 58tt and I got used to it so much that when I got my new bike 62tt, which was recommended by WS, I felt funny. However, WS did at least one thing right: It corrected my seat height, and this was a big improvement. I think I get used to the new tt length fairly soon. This could have easily been the opposite. One of the sure ways of judging is whether you find improvements/worsening on efficiency, pain, exhaustion etc. This takes time. BTW, I also used the Colorado Cycling measurement chart and got almost identical numbers with WS.
A lot of it depends on who takes the measurements...DINOSAUR
Jul 20, 2002 8:51 AM
I went throught the new bike fitting thing and used the Wrench Science online fitting guide. My wife took the measurements and she got 2 different inseam measurements. 34" put me on a 58cm c-t, 34.50" put me on a 59cm. But the important measurement is the tt length. I had the owner of my LBS do a fitting for me and he put me on a Colnago MXL 59cm with a 56.9 tt. I have the saddle raised high, showing a lot of seat post. If I would have gone with the 58cm I would have had to jack the saddle up way to high. You might be better off having someone that is familiar with bicycle fitting to take the measurements for you. We also had a discussion about how I liked to ride and the position I was looking for and he wrote down a bunch of notes and used them when he built my bike. He was dead on, the only two things I have messed with are the saddle position and the bar angle, and it was just a matter of adjusting to a different geometry.
I'm 6-0 and going by charts I could be on any bike ranging from a 57-59. But the kicker is I have long legs for my height and a short torso. Getting fitted correctly is really important, this was my first professional fit (had it done for free) and it paid off....also the fit guides are based on norms, which doens't exist as a lot of your set up has to do about preferences and flexibility..

Also if you go the LBS route ask if you can swap out stems if the one you are fitting with doens't work (mine did). Also start with your bars raised high and try it for awhile until you have the steerer cut. If you have an LBS you can trust, I'd go with them. My LBS usually doens't do any type of fittings but when I mentioned I was thinking about a custom bike with a fitting done by the frame builder they were glad to accomodate me as they wanted my business...also if you have a good relationship with the owner of your LBS inquire about a discount...he whacked 22% on my purchase the big savings was on the group and wheelset...