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help w/size(8 posts)

help w/sizePhetstef
Aug 28, 2001 5:50 PM
Im 5'8" and want to purchase '98 54 cm C-dale. My inseam is 30 inches w/0 shoes, and the standover ht. for the bike is 31.2". With the shoes, my inseam would have about .9" clearance according to the
"idiots guide to proper fit" message". Am I worrying to much about it? 54 cm seems like a good size.
standover it in bare feet...C-40
Aug 28, 2001 6:11 PM
It's not a good size unless you can safely mount and dismount without injuring yourself. You really should have 2-3cm of clearance to "hard" contact (that would lift your heels off the floor). If you can barely standover it in bare feet with your heels on the floor it would be considered as large as you should ride. Only your shoe thickness will be providing any clearance.

For your height, the 54cm will have the proper top tube length to use with a 110 or 120 stem, depending on your preferred saddle position.

I'm 5'-7" tall, with an 83cm (32-5/8") inseam (or standover) in bare feet. A 54cm C'dale fits me fine, with a 110 stem. I have about 3cm of standover clearance in bare feet.
not sure about your calculationsET at home
Aug 28, 2001 6:29 PM
I'm the author of the "idiot's" guide, FWIW. Assuming your inseam was indeed measured the Colorado Cyclist way (sticking book up with firm pressure), adding two cms (which is less than an inch) to your inseam would give around 30.8" in shoes/cleats, still less than the bike's 31.2" standover. Ouch!!
most idiots don't measure inseam correctly....C-40
Aug 28, 2001 6:52 PM
This seems to be a prevalent problem. Undermeasuring inseam is pretty easy unless someone's shoving that book or level up real hard.

I get the best results using a bike with a level top tube and blocking up the wheels, until you get alsmost enough pressure to lift your heels of the ground. Measuring from the floor to the top of the top tube gives a very reliable measurment.
not sure about your calculationsPhetstef
Aug 28, 2001 7:09 PM
It seems that the standover ht for me with my short legs and long torso is never correct. I ride a 17" mtnbike and the clearance isnt more than an inch; however, the top tube length is fine, and it doesnt feel cramped. That is something Im trying to avoid when I buy a road bike. 53 would be good, but there's nothing on ebay fitting that description. Oh well.
remeasure your inseamJohnG
Aug 28, 2001 8:33 PM
I'd be a bit surprised if your true inseam length was just 30". FWIW, I'm 5' 8" with a 31.5" inseam and the 54cm Dale fit me fine.

IMHO, standover is not the best way to fit a frame (assuming you have some that is ;).

YMMV
JohnG
remeasure your inseamPhetstef
Aug 29, 2001 5:05 AM
YMBR, It is an average between 29.75, 30.25, & 31". A long torso could be a factor for proper fit.
Misfitsjtolleson
Aug 29, 2001 2:52 PM
are no bargain. It sounds like you're eyeing a used bike, perhaps it is because it is a good deal, and looking for permission to ignore an obvious fit problem. I don't think that anyone here can endorse that.

If you've got a 30" inseam and are truly 5'8", then you definitely have the short-legged long-torso that will make some bikes simply not a good fit. Obviously a longer stem can help tweak a close call, but is no substitute for a proper frame size.

Rather than fixating on the 'Dale and deciding how to make it fit, why not hit a shop with a decent selection (esp. perhaps including the longer top-tubed Lemonds) and really work with someone on size. Standover clearance cannot be ignored... "ouch" factor aside it will be an issue every time you stop for a light and particularly when uneven pavement can make the dismount problematic even on a proper fitting bike.