Frame sizing HELP!

by tonyhogg   March 3, 2014  

I've currently got a Scott cr1 premium with di2 in 54cm, I need some help and advice on sizing for my next bike, choices bianchi infinito cv in 55, bh ultralight in 57, or cipollini bond, really not sure which sizes would suit me best, tried a bmc team machine slr01 in 54 and 56 neither felt comfortable.

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I've currently got a Scott cr1 premium with di2 in 54cm, I need some help and advice on sizing for my next bike, choices bianchi infinito cv in 55, bh ultralight in 57, or cipollini bond, really not sure which sizes would suit me best, tried a bmc team machine slr01 in 54 and 56 neither felt comfortable.

posted by tonyhogg [62 posts]
3rd March 2014 - 10:45

1 Like

Help!

posted by tonyhogg [62 posts]
3rd March 2014 - 10:48

1 Like

I've currently got a scott cr1 pro premium with di2 in 54cm, not sure on my next frame what size to go for 54 or 56ish, looking at a bianchi infinito cv in 55cm, bh ultralight in 57cm, or a cipollini bond. I've tried a BMC team machine slr01 in 54 and 56 and wasn't comfortable on either really. I've also had a Specialized BG fit session which recommended me a more relaxed geometry bike not a race type with large saddle to bar drop.

I've included my measurements in competitive cyclist fit calculator:
actual inseam 84cm
trunk 61cm
forearm 34.5cm
arm 68cm
thigh 60.5cm
lower leg 56cm
sternal notch 144cm
total height 178cm

also tried wrench science
Height 178cm
sternum notch 144cm
inseam length 84cm
arm length 62cm
shoulder width 38cm
felxibility 3
weight 140lbs
fort size 9 us

Please help me understand the measurement relating to my cr1 and the new bikes I'm looking at thanks.

posted by tonyhogg [62 posts]
3rd March 2014 - 11:04

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Did the Specialized BG fit session suggest an optimum stack and reach? If so, that might be a big help. For example the review of the Infinito 55cm on this site has a comment stating the stack and reach at Stack 380, Reach 567. If the bike fit suggested what would be right for you, you might have something to go on. Maufacturers websites often, but not always, quote these. Even if you don't have an optimum suggestion from the fit looking at the different bikes this way may help.

Ride more, ride better

posted by Sniffer [134 posts]
3rd March 2014 - 12:30

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Bike fit didn't suggest anything really, that's the problem, current cr1 setup is, reach bar to hood 51.5cm, drop 42mm, that's all the info I have on that, I feel I could do with a longer length stem, my standard setup got changed during the fit, spacer removed, stem flipped up to give more breathing capacity, not sure I need it flipped, looks very amateurish lol, not really noticed any difference in comfort either, perhaps a bit less

posted by tonyhogg [62 posts]
3rd March 2014 - 15:48

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I'm really thick and don't understand stack or reach very well, also angles and degree really confuse me to be honest, based on my measurements would most people say I'm 100% medium frame 54cm/56cm or large 56/57 size, I'm very concerned if I go large I won't be able to make adjustments to dial the fit in to suit me correctly, basically I've tried a large boardman cx bike and a mountain bike and didn't feel they suited me in large, felt way too big.

posted by tonyhogg [62 posts]
3rd March 2014 - 16:43

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Just go for something similiar in measurements to your Scott ?

posted by yenrod [100 posts]
3rd March 2014 - 20:11

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Tony, don't want to make any assumptions but your fitter should take the time to explain to you the important points of your fitting (ie, what bike geometry is ideal for you given your body positioning during the fit and what key points to look at like reach, stack, and seat positioning). I'd go back and have him go over it with you and if he's not willing or you can't seem to communicate with each other perhaps talking with a different fitter would help. It would suck to have to pay another £100 for a second fitting but it would be tragic to end up with a £1500+ bike that doesn't fit you. If you feel uncomfortable, physically or psychologically, it's best to listen to yourself and have them go through it with you as for a lot of people, it's easiest to understand when you're right there on the bike with a mirror or video so you can visualize it better. Just a thought.

Melancholy is incompatible with bicycling. ~James E. Starrs

movingtarget's picture

posted by movingtarget [135 posts]
3rd March 2014 - 22:15

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Assuming you find the Scott comfortable with its current set-up, get out a tape measure and measure horizontal distance between head tube and seat tube (don't measure the actual top tube, unless its horizontal, as the amount of drop will affect the measurement) and the head-tube (plus spacers to stem) and see which of your options' geometries comes closest. It's a bit crude but should get you close enough. Then go and test the bike, preferably on the road.

posted by allezrider [78 posts]
4th March 2014 - 17:45

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Panic over! Just had another bike fit, I'm definitely a medium all day long no doubt at all now, 54/55 size, it's been worth getting both types of fit, my mind is at rest now and I can concentrate on the new bike.

posted by tonyhogg [62 posts]
4th March 2014 - 20:58

1 Like