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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 04-20-09, 11:45 AM   #1
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Road Bike Frame Size Questions

Ok! So, this may or may not be the correct place to post this, but I'm going to give you guys a shot anyways because A.) I'm a clydesdale and B.) You guys are so friendly and helpful.

When I've looked around the internet I have seen all sorts of conflicting ideas on how to find the correct size frame for a bicycle. Some of these vary by up to 5CM of frame size!
My research also told me how important the fit of my bike is, and that if it doesn't fit properly I'm going to hate cycling...which is even MORE discouraging.

I have been riding a bike given to me by a buddy, but the bug finally bit me and I need something of a bit more quality. (AKA something that people won't laugh at me for riding to sportive events.)

The bicycle I have been looking at is the BeOne Storm (which can be found if you follow the link
Unfortunately I have to purchase this online due to only one distributor in the UK. (
I have read plenty of reviews on it, and very much like what I see. So I'm pretty set on that specific bike.

I am 6 feet tall (182CM)
My Seam (which I measured while wearing cycling shorts) is 32 inches (82 cm)
And I weight 230lbs but that is steadily dropping.

So what size of frame should I be riding? These are the offerings the web site gives (50 53 56 59 62)
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Old 04-20-09, 12:04 PM   #2
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I'm your size @ 6' 0" and 220 lbs but have a 33 inseam. I use a size 60cm. It's a little big, but this has benefits. The taller headtube raises the handlebars without the need for multiple spacers. I like being stretched out and my bike fitter suggested the size 60 since I intend to use the bike for commuting and longer rides in the 35 to 100 mile/day range.

Looking at the geometry data, the 59cm size should fit very well.

This is my bike with fitting info included:
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
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Old 04-20-09, 01:15 PM   #3
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I'd recommend buying a bike that you can test ride first (and that a local shop can service/warranty), but if you're really set on the one you linked, test ride similar bikes with similar geometry to dial in your size.

I'm about your height but with a 33-ish inseam and ride a 56cm with a 55.5cm top tube length (effective) and this fits me. I could maybe ride a 58cm in some frames. Top tube length is really the important dimension, as long as you can straddle the bike. Search here and in the Road forum, there are literally thousands of threads on bike fit.
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Old 04-21-09, 03:18 PM   #4
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I agree with Lambo about top tube length. The top tube length is everything. I used to own a Trek and that bike was a 60 cm frame. With a 34" inseam, most people will tell you that that is right. That's not always the case however. I now ride a Felt and my frame size is a 58 cm because Felt has a longer top tube than the Trek. It looks like my bike is slightly smaller than I should be riding until you see me on it. Also, if you fall between sizes, get the smaller size frame. It's easier to make adjustments to the smaller frame. One of my buddies rides a Lemond and his frame is actually a little too big for him. He's been fitted and has discovered that the bike is a little bigger than he should be riding. Seat position and shorter stem helped a little but he's still not fitted correctly on his bike.
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Old 04-22-09, 08:39 AM   #5
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58, 59, or 60cm. Just find one with a top tube long enough for you without using a long (120cm +) or short (90cm or less) stem.
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Old 04-22-09, 09:02 AM   #6
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Top tube length is key. Should be a TT length that allows you to bend your elbows slightly when resting on the hoods. If you have to straighten you arms all the way then the TT is too long (as long as the stem is between 90-110).
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Old 04-22-09, 09:13 AM   #7
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Are you measuring your inseam with a book? Stand barefoot on the floor, back against the wall, with a book (also tight against the wall) firmly pulled up into your crotch! Then measure the top of the book.

I wear size 32 length trousers, but measure 33.5" using this method.

I am 6', down to 188#, from 212, and comfortably ride a 61. A 58 was suggested, but I feel more comfortable spread out a bit. The 58 just felt cramped.

Ride two bikes of the same model. Have them both set up identically, same tire pressure, everything. You will know instantly which one fits best.
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Old 04-22-09, 02:52 PM   #8
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Hmm I am 6'7" and ended up with a good fit on a 58" fuji newest, realy the only way to know for sure is get on it and see how it feels to you
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Old 04-24-09, 09:52 AM   #9
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As`a coach I have fit hundreds of bikes. The rule of thumb for road bikes is the frame size should be 2/3 of your inseam. 82cm X 66.3% = 54.366. I find that this formula give the smallest frame that will fit. Given the size choices I would go with the 56.
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