Bike Forums - View Single Post - Fitting Confusion.

09-14-13 | 02:47 PM

#13

chaadster

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Joined: Aug 2008

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From: Ann Arbor, MI

Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada

Quote:

Originally Posted by vcand

Ok, I think Im starting to understand their sizes.

I "should" be a 56cm from what I am being told. Now if I understand sizing, 56cm "should" be the length of the seat tube, correct? If that is the case, in the Motobecane specs for the bike that I am looking at, a 56cm bike has a 53.3cm tube. A 58cm bike has a 55.3cm tube. So technically, the 58cm bike actually has a seat tube of about 56cm, which is a 56cm in a normal bike, which is where I should be, or did I butcher all that?

This is where all the confusion from BD comes into play, they have "general guidelines" all over the place which contradict the bikes actual specs.

On the bikes page under "General Sizing", I should be a 56cm, based upon height. On the "Sizing Tips" page (http://www.bikesdirect.com/products/roadsizing.html) it wants me to measure my standover height, which is 33inches. It then says get a bike with a minimum of 32inches (one inch less), which is 58cm on their chart. The bikes specs align with be being a 58cm

Now for crankset, I am told I should be about 170mm. On the bike I'm looking at the sizes are:

47-52 = 170
54-56 = 172.5
58-64cm = 175mm

The bike Im looking at is:
http://www.bikesdirect.com/products/.../mirage_sl.htm

(specs and sizing link is under the images)

They only have a 58cm left, so I want to be completely sure to rule that size out. I'm also emailing them my specs and seeing what they recommend, maybe they will be able to bypass all the conflicting information.

Dude, you really need to do more reading before you link any of what you think you know to a purchase decision. I'm not trying to be mean, but you're just all over the place, and don't at all have a solid understanding of the basics on which to stand. And the way you ask questions, well, if you get to where you want to be, it will be due to luck and not rigor. My best advice to you is to read 3 books or articles on bicycle fit, and then come back with questions. There are lots of well-intentioned folks here, but this thread is a hot mess.

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