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Bike fit Q: 5'10" w/ 31" inseam(14 posts)

Bike fit Q: 5'10" w/ 31" inseamoddi
Sep 22, 2002 12:25 PM
I am 5'9.75" w/o shoes on, w/ a 31" inseam, also without shoes. I was wondering what size roadbike I should get. I looked at some of the online formulas for calculating bike size, but based on those formulas and my inseam and height, it looks like I should be on a 51cm C-C frame. Is this right? From looking at what other ppl my height ride, this seems small. Maybe I fudged the calculations. Any input is much appreciated.
re: Bike fit Q: 5'10" w/ 31" inseamdesmo
Sep 22, 2002 12:47 PM
Those online formulas don't work too well for people with short legs. I'm 5'8" with a 31" inseam and I ride a frame with a 53cm c-c seat post and and 55cm c-c top tube. This fits me well, and I have about 4" + of seatpost showing. The standover clearence is very close but I need the top tube length. At 5' 10" I'd expect you would need something pretty close to that with maybe a longer stem than I use (10), assuming we're talking about road bikes set up for fairly aggressive riding position. Best to go and test ride some some stuff. Good luck.
31" inseam?Dave Hickey
Sep 22, 2002 1:05 PM
Do you wear 31" pants or is your inseam 31". There is a big difference. True inseam is measured for your crotch to the floor. The easist way to measure is stand with your back against the wall. Place a book up into your crotch and have a partner measure from the top of the book to the floor.
actual inseam is 31" (nm)oddi
Sep 22, 2002 1:42 PM
actual inseam is 31" (nm)No_sprint
Sep 23, 2002 7:59 AM
At that inseam, a 53cm c-t will offer you approximately 1/2 cm standover clearance. That would be a good place to start. You will likely want something that will offer you max. TT length. Look into semi sloping designs. I love my QPro.
re: Bike fit Q: 5'10" w/ 31" inseampeter1
Sep 22, 2002 2:20 PM
Why don't you go to a really good shop and sit on a few different sizes of bike. If they know what they're doing, they'll find a bike that fits you just right. Actual numbers are irrelevant.
i'm almost the exact same numbers as you.rufus
Sep 22, 2002 4:05 PM
same height, extra half inch inseam. i'm riding a 54cm c-c, with a toptube about 54.5cm.
i'm almost the exact same numbers as you.WrigleyRoadie
Sep 22, 2002 4:17 PM
Ditto, and I'm on a 55cm. Not much seatpost showing though :-)
No clearance???C-40
Sep 22, 2002 6:05 PM
Geez, you guys are pushing it. Most frames of this size have a standover height of 31" to 31-3/8".

A better solution is to get one of the new compact frames.

I'd rather use a 1cm longer stem on a 2cm smaller frame, rather than have no standover clearance and little post showing.
It's like a cheap hotel.SnowBlind
Sep 23, 2002 7:03 AM
54cm Bianchi Veloce no ballroom at all. One mistake and crunch.
Personally, I suggest looking at a sloping top tube bike, and give the boys some room.
Or maybe rap the TT in foam tubing?
Absolutely!!!!!!!!!!!! Good job C40!!!!!No_sprint
Sep 23, 2002 8:01 AM
Most rec riders are on bikes too large.
try a compact frame....C-40
Sep 22, 2002 6:15 PM
Stock frames are made for folks with average to long legs.
I'm about 3 inches shorter with legs that are 1-5/8" longer. I get a good fit on about 90% of stock 54-55cm frames (measured c-t). You have short legs and a long torso.

One of the new compact frames with a sloping top tube may provide a good solution for someone with such short legs. You will get more standover clearance and a top tube that's long enough for your long torso.

Look for a frame with a top tube length in the 55-56cm range. Try to maintain at least 2cm of standover clearance.
hmmm, never thought of myself as having short legs...oddi
Sep 22, 2002 8:03 PM
I always thought I was pretty normally proportioned. I figured most ppl my height had inseams between 31 and 32 in. I know that I pretty much fit anything sized medium, esp. stuff from Banana Republic. Anyway, thanks for the advice.
Then maybe you should measure again.djg
Sep 23, 2002 9:32 AM
I'm sorry if this is all very clear to you, but if you are 5'10" and have a true 31" inseam, then your legs are much shorter than average for your height. You say that's not your impression, so I'll suggest taking the measurement again or having it done for you. The measurement goes from the floor right up to the bone--you don't want to cause pain taking it, but you do want to shove the bits to the side and put some pressure on the soft tissue. This should yield a very different measurement than the length of the inseam on your slacks.