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Old 08-03-07, 02:32 PM   #1
iced_theater
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Trip to salt lake ciy and question on frame sizes.

For frame size, is there any correspondence between inches and centimeters? I've seen a couple bikes that showed it in inches, but most frames are measured in cm. I tried the 7.3FX and it was a 20" frame and fit me good, but how does that compare to a 56 or 58cm and still fit about the same?

I rode a few bikes while I was in Salt Lake City yesterday and found that I would need something between 56-58 cm. I rode a Trek 1000, Giant OCR3, and a Raleigh Grand Sport. They were all 56cm but the Trek fit best out of those three followed by the Raleigh but I think a 58 would fit best overall.

I also tried a 7.3FX and found that while it was nice, I would definitely not be happy with it in the long run. So it's a good thing I didn't just order one from my LBS and pay full price and shipping for it.

I went to five different bike shops and found two that seemed good. Hyland Cyclery was by far the best shop of the five followed by Taylors Bike shop. Taylors was second because I had one guy who seemed to know a lot talking to me for a little bit, then he had someone who had no idea help me.
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Old 08-03-07, 05:32 PM   #2
trace22clawson
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It's not always just the frame "size" that is important in getting fitted for a bicyle. You also need to consider the geometry (they might all be the same size... but they look different - sloping top tubes, long/short head tubes, they even come with stems that are different lengths and different angles.) It's kinda like shoes... yeah a 9 1/2 or 10 are "about" the same.. but a narrow shoe vs. an EEE width sure fit differently. My LBS here will charge $25 for a bicycle fitting... one-on-one with a top notch bike expert. He puts you onto a bike fitting machine (looks like an indoor fitness bike) and shift the different tubing, seat post, stem, bars, etc... to get you into a comfortable riding position. This all takes about a little over an hour. He provides you with a print out of the sizing and geometry that is best for you to provide you with a comfortable and appropriate riding position. If you buy a bicycle from his shop, he doesn't charge you anything for the fitting session. I would think that this would be the best spent $25 of any bicycle related purchase ... well, maybe a helmet might be more important.
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Old 08-03-07, 05:35 PM   #3
deraltekluge
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One inch = 2.54 centimeters, so a 20" bike would be called a 51cm bike, but that doesn't tell you the whole story. Look at the difference in frame shapes between the Trek 1000 and the Trek 7.3FX...


Trek shows this diagram for its size measurements...

Notice that the size figure (seat tube length) would be different for bikes that have different frame geometries but are otherwise comparable in actual size. You can't really directly compare the numbers between bikes of different types and between bikes from different manufacturers.

Last edited by deraltekluge; 08-22-07 at 11:44 AM.
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Old 08-03-07, 08:57 PM   #4
iced_theater
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Which makes it hard to chose a bike that doesn't have that type of info. I don't really have the money to spend to get a high quality bike like one of those, unless I go used. Then I gotta hope the person selling the E-bay bike is honest in the listing.

If I were to find a nice used road bike such as the Trek 1000, Raleigh Grand Sport or similar for under $400 shipped, then I would easily go for that. But as it sits I'm in the process of buying a house and so I don't want to sink all my money into a bike.

So I've been looking at this Costco Schwinn Seneca http://www.costco.com/Browse/Productgroup.aspx?Prodid=11215876&whse=BC&Ne=4000000&eCat=BC|111|195|22170&N=4007944&Mo=5&pos=3&No=5 &Nr=P_CatalogName:BC&cat=22170&Ns=P_Price|1||P_SignDesc1&lang=en-US&Sp=C&ec=BC-EC10999-Cat195&topnav=
If I knew how to shorten that address I would I talked to a guy at Costco yesterday and he said if I ordered a bike online and didn't like it, I could return it to the warehouse and get the money back including the fee for not being a member. So I'm strongly leaning towards doing it that way.
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Old 08-10-07, 07:34 PM   #5
deraltekluge
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Quote:
Originally Posted by iced_theater View Post
If I knew how to shorten that address I would
Come up with a name for the site, and type it in to your post. Then highlight that name, and click the "Insert Link" icon at the top of the edit box, and enter the URL in the resulting dialog box...like this: your link

The result is a clickable link of any sort your heart desires.
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Old 08-11-07, 11:48 AM   #6
Banzai
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deraltekluge and trace beat me to the geometry discussion, so I won't get into great detail.

The measurement you are referring to is the seat tube measurement. It's the length of the seat tube from bottom bracket (where your crank is) to the top of the tube. (Or the center of where seat tube and top tube join. But that's another discussion in measurement methodology.)

Is there a correllation?

Aside from the 2.54 conversion factor, there is very little unless you are comparing bicycles of similar geometry. For instance, for a guy of my size, a bike with "mountain bike" geometry in approx a 16 inch frame is appropriate. However, 16 inches with "road" geometry would be ridiculous, and the bike simply wouldn't fit. In a road bike I ride a 50cm frame, which is closer to 19.7 inches.

Many factors influence this, from intended posture of the rider, to bottom bracket height above the ground. Bike fit is a complex "problem" and done wrong can impact your efficiency at best...your ride comfort and enjoyment at worst.

If you're in Salt Lake, where to go depends on your budget. Contender Bicycles on Ninth and Ninth is very good. Bingham Cyclery has locations all around the Wasatch front, and they have a great reputation, and I've shopped there often. Canyon Sports in the summer months caters to cyclists, and they have an affordable lineup of Raleighs...and they usually have great sales as the ski season approaches. I forget the name of the shop on Broadway (3rd south) in Salt Lake...but they had a nice operation that had a good reputation.
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