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Giant OCR1 Frame sizing issue(7 posts)

Giant OCR1 Frame sizing issuebiketalk
Aug 7, 2002 5:45 AM
Hi there fellow bike junkies like myself. I'm in the process of looking at purchasing a road bike to hlep get in some extra miles for the trails and have been looking at a 2002 Giant OCR1 bike that at my LBS I can get for a great price as I know them there fairly well. The only thing that I'm a little unsure of is that they only have a small size left (which the bike shop guy says is the right size for me). I'm 5'-9" and have about a 29" inseam and had been looking at some regular road bikes ina size 54 cm frame. I realize that these Giants are a tad strange when it comes to sizes but I want to make sure that this is in fact my size. I cannot see the guy at my LBS trying to steer me wrong as he knew I'd be back if it felt too small. I have read various reviews and it seems that the sizes of peopler and frame sizes are all over the map on these guys. I have seen some guys who are 6' on mediums and then a guy at 5'8 on a medium and thus why I'm confused. Any thoughts from anyone having one of these would be much appreciated.

Tough call.Spoke Wrench
Aug 7, 2002 6:02 AM
At 5'9", with a 29" pants inseam, I'd suspect you have somewhat short legs. Giants are unconventional geometry, so you are trying to fit an unconventional body onto an unconventional bike that has an unconventional stem. I think that's a pretty tall order over the internet.

I'd suspect that a medium would fit you better. If you have short legs, then you must have a long torso that would benefit from the longer "virtual top tube" length on the medium. Then again, I've never seen you and the guys at your LBS, who you seem to trust, have. Surely they have a medium sized Giant that you can compare. That's what I'd want to do.
you sure about your inseam length?JohnG
Aug 7, 2002 6:31 AM
29" is VERY short for someone 5' 9"

For example, I'm 5' 8" with a 32" inseam.

If you do have such a short inseam then you should use the medium sized frame.

FWIW, I have a medium and recently got my small frame as a replacement.
re: Giant OCR1 Frame sizing issueflying
Aug 7, 2002 7:39 AM
Are you saying 29" pants inseam
or measured the usual way with a book between your legs against a wall?
29" seems short for 5'9"
re: Giant OCR1 Frame sizing issuebiketalk
Aug 7, 2002 8:10 AM
yes 29" using a tape measure that was the rough number from floor to crotch.
re: Giant OCR1 Frame sizing issuefbg111
Aug 7, 2002 3:17 PM
I just bought a medium OCR1 a few weeks ago. However, as this is my first road bike, I'm by far no expert, but I'll tell you what I can. I'm 5'11" with a 33.5 inseam and it seems to fit me fairly well. It may even be a little long for my upper body, as I have to stretch out my arms somewhat for my elbows to reach the aero bar pads on the handle bars. I understand that when you're resting on the aero pads, your upper arms should be perpindicular to the ground, or close to that, so you can rest your upper body on your elbows without using a lot of arm/shoulder/back muscle energy. As for the lower body, I get the impression from reading about Giant's Compact Road design that the lower body measurement should be taken care of by seat heigth alone. So as long as the frame fits your upper body correctly, solve any lower body fit problems by trying different seat post heights. I could be wrong there though, so ask your retailer about that.

Also, is there any way you can find another shop with a medium frame that you could test out, for comparison?
re: Giant OCR1 Frame sizing issueastrobiker
Aug 7, 2002 6:04 PM
I have that bike - am 5'9" with around a 31" inseam, and the medium frame is perfect for me. I had them switch in the stem from a small frame to get just the right fit. I would be very surprised if a small was right for you. We just got an OCR3 for my wife - she fitted out on a medium frame also and she is probably 5"6" or so. (Frankly I am not really sure it is right for her, but she says it is just right, and my ulterior motive is to let her upgrade to my OCR1 when I graduate to something wonderful later!)