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Advice on bike frame size.

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Advice on bike frame size.

Old 09-11-09, 09:37 AM
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deepseadiver
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Advice on bike frame size.

Hi first off I hope this was an okay place to post this, I also thought about posting in mechanics but wasn't sure.
Anyway last year I had my bike stolen at school and I've been looking to purchase another online.
I've never actually needed to know the bike size I'll need because I tested my last bike in the store.
However, my parents aren't going to be purchasing me a new bike so I'm just looking for good cheap bikes online.
I am 5'10" - 5'11" with a 34" inseam. What bike frame size would be best for me? I'm thinking 60cm would be suitable but I've come across a great bike at a great price that is 64cm. Would that be too ridiculously tall for me or could I possibly fit it? I also have an inquiry about the other end of the spectrum? Could I fit something less than 58cm or would that be too difficult to ride?

Also this would be my first single or fixed gear.
I had a Raleigh women's hybrid and while it was lovely and I adored it, she was awfully heavy and bulky and I'm looking forward to a sleeker, faster ride.
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Old 09-11-09, 11:31 AM
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Forget 64cm. That is for way taller people than you.

First of all, did you measure your inseam barefoot with with your back to the wall and a ruler (or 2x4) levelled and yanked hard up into your crotch?

Your inseam is quite long, so with your height it sounds like your torso/reach is short. I would go so far as to say that you'll want a 58 with a highish seat, or 59/60 with a very short stem (90mm).

You should also consider a frame with a shorter top tube--most come with equal length seat tubes and top tubes, which are unfortunately the standard for sizing a frame when it's the top tube that's more important. I have a Bianchi road bike that's 61/57--it's tall with short reach. A lot of track/fixed frames are the same way.

Last edited by Samwiches; 09-11-09 at 11:39 AM.
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Old 09-11-09, 02:20 PM
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I measured my inseam with a measuring tape, its also the inseam of all of my jeans. Is that not how I should have measured it?

Thanks for all of that information! I'll definitely remember that when I have more money for a nicer more customized bike.

I found another bike for sale that is "20" from the bottom of seat post to middle of pedal". Is that something that would fit me?
This is the ad:
https://raleigh.craigslist.org/bik/1369333191.html

And this is another bike I was considering:
https://raleigh.craigslist.org/bik/1369628479.html

They're some of the cheapest bikes to come up that still seem to be in pretty good condition.
Your thoughts?
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Old 09-11-09, 02:41 PM
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That's the wrong inseam--not your true inseam. You need to do like in this pic, but it would be easier with your back to the wall:



Pull that book into your crotch--all the way--shove it right up in there to approximate sitting on the saddle. Measure from the top of the book to the floor and that's your inseam. First get that measurement, then look at bikes.

edit: And not those two bikes, they're completely bottom end heaps that you'll regret spending any money on. Also, that Ross is not a 60cm at all, it's more like a 50. Both are for someone around 5'.

Last edited by Samwiches; 09-11-09 at 03:05 PM.
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Old 09-11-09, 03:04 PM
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For an idea, either of these would be better to start with and are probably more your size. The Centurion has a pretty good price for a full road bike around your area--you can trade out the geared parts for a fixed rear wheel and "track" crankset.

https://raleigh.craigslist.org/bik/1321934515.html

https://raleigh.craigslist.org/bik/1331275939.html
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