Frame size, new bike fitting, questions

[PSM]

You are the scientist here...

[Trumpets]

Thanks for your replies so far, just as a quick note, if i went for the 52s this would also have the handlebars slammed tight to the head tube with forks cut off in that position (head tube on a 52s is 163mm).

What worries me is that i'm not that flexible anymore (its an age thing lol) and prefer to have just 8cm seat to handlebar drop, i don't want an aggressive look or feel. I am looking at endurance sportives of 90 miles + therefore want a comfortable ride. If I went for the 52s i would have no option but to run around 10-11cm drop as I will have no upward adjustment without buying new front forks.

I also understand that the top tube is going to be taller, i currently have 2.5 inches of stand over height on the Holdsworth, I cant find top tube height for the C60 frames however I would assume with the head tube at 14mm higher than what i currently run the top tube will be around the same in extra height at 14mm (1/2inch or so) therefore reducing my stand over height to approx 2inches. Considering my height on paper most suggest the 52s however some websites suggest the 54s will suffice riders from 5ft 10in to 6ft 2ins?

[soracabana]

Trumpets, what do you think about a custom C60?

[PSM]

I think spacers, correct stem lenght and a movable seatpost/saddle will be just fine.

[soracabana]

It's always better to avoid spacers if possible...

[RickDraper]

I am about to order a Colnago C60 and wanted some sizing advice.

I am 176.5cm tall with a 84cm inseam and I ride a 74cm saddle height. What size should I be looking at 50s or 52s? Someone said I'd need to be very flexible to fit on the 50s so I'm looking more towards the 52s.

[Marin]

It's always better to avoid spacers if possible...

I don't agree, for a given saddle to bar drop, a smaller frame with e.g. 20mm spacers will often look better and be stiffer and lighter than a taller one without spacers.

[maxxevv]

I am about to order a Colnago C60 and wanted some sizing advice.

I am 176.5cm tall with a 84cm inseam and I ride a 74cm saddle height. What size should I be looking at 50s or 52s? Someone said I'd need to be very flexible to fit on the 50s so I'm looking more towards the 52s.

I have almost identical measurements ( same inseam, same saddle height, height difference by 0.5cm) as you have here but then, but the arm length and flexibility also plays a big part in your choice of fits.

I had a 50S EPS on a 110mm, -10 degree stem previously with 20mm worth spacers and a 25mm setback post. And it was my most comfortable fit ever, granted I have really poor flexibility.

I would say, a 50S will provide a little bit for flexibility in fitting. Its easier to plug in a longer/ higher stem or more setback seatpost, but not the other way round.

[RickDraper]

I am about to order a Colnago C60 and wanted some sizing advice.

I am 176.5cm tall with a 84cm inseam and I ride a 74cm saddle height. What size should I be looking at 50s or 52s? Someone said I'd need to be very flexible to fit on the 50s so I'm looking more towards the 52s.

I have almost identical measurements ( same inseam, same saddle height, height difference by 0.5cm) as you have here but then, but the arm length and flexibility also plays a big part in your choice of fits.

I had a 50S EPS on a 110mm, -10 degree stem previously with 20mm worth spacers and a 25mm setback post. And it was my most comfortable fit ever, granted I have really poor flexibility.

I would say, a 50S will provide a little bit for flexibility in fitting. Its easier to plug in a longer/ higher stem or more setback seatpost, but not the other way round.

Thanks, if it helps I have a 179cm wingspan.

Going to a Colnago dealer on Monday to have a sizing. I think the last time I went there I think they got the size wrong but we will see this time.

[maxxevv]

Your arm stretch measurement also includes your shoulder width here, so it doesn't really count for much in relative comparison.
Also, as said previously, the overall flexibility as well as physical proportions ( long torso/ short legs, short torso/long legs, average torso/average legs/ long necks etc, etc) all play a part in fit. You preferred riding position is equally important too.

If you want a remotely diagnosed first cut fit, would suggest asking someone to help you measure and try the bike fit at Wrenchscience.com.
I find it pretty good as a first cut as it was within a few millimeters of what I found most comfortable from years of tweaking. Its a free fit, just need to register.

Hope it helps.

[Rondje]

Hey, I'm currently looking into a new bike as my old frame broke down on a accident.
Currently thinking of buying a Infinito CV but I'm bit on doubt about the size. My previous bike was a Focus Cayo size 54 and I am doubting between the 53 or 55 Infinito CV. I can't test drive them so have to go from the sizing chart, a friend of mine has the older infinito in 53, but his saddle is allot lower and the bike felt really small because of that.

The sizes: Seat tube / Top tube / Head tube/ Reach / Stack
Focus 54 : 54,0 / 55,2 / 14,5 / 38,7 / 54,1
Infinito 53: 50,0 / 53,5 / 15,5 / 37,3 / 55,1
Infinito 55: 52,0 / 55,0 / 17,0 / 38,1 / 56,7

The reason I'm not sure on the size is because my current bike had a 10mm shorter stem and I think around 2,5 cm of spacers. This would make the 55 (with the 17,0 head tube) perfect, but if I ever want to sit deeper I can't because the stem is slammed. My bike fitter advised a 50, which is definitely too small (i think he was confused with the 53 as that one has a 50 seat tube) with a 10mm longer stem. Knowing this the 53 seems logical but I'm just a bit scared that it might be too small (like my friends bike) or that i still end up with a spacer tower (which i want to avoid), Definitely don't want more then 2/3 spacers.

Do you think the 53 is best as well? Thanks for any advice.

[jeffy]

Ronje - regarding limitations of drop when you have the stem slammed. There is much more flexibility than you would think.

consult the stem tool here - http://yojimg.net/bike/web_tools/stem.php

i have selected to compare two stem angles both negative angle (pointing down) and towards - but not at the extreme. -6 & -17
with variable/multi angle stems such as the Specialised CLP you can go between 4 to 24 degree angles rather inexpensively.

as the image from the stem tool shows. the difference between -6 and -17 degrees is 19mm drop. considering that i personally 'notice' a variation in drop of only a couple of mm (upper back/shoulder pain), 19mm is substanial.

[Rondje]

Thanks for the info Jeffy, totally forgot about the option of negative angle to still go lower. But think I'l go with the 53. Not really a big fan of negative drop and then the 55 wil mean that I won't have much room to go lower if I want to. Think I ask my friend again to sit on his bike and see if I can change the saddle height a bit.

[jeffy]

if your current bike has 25mm if spacer. the 53 Infinito would only require 15mm of spacers assuming the same headset cover size and stem angle.

assuming a 15mm longer stem is hard to find
the exact spacer size and extra stem length can also be controlled somewhat by stem angle.

the stem comparison tool is very useful for getting an idea of translating fit.

try your friends 53 at the saddle height of your Cayo (measured from BB)
with a stem either 10 or 20mm longer than you use on your Cayo and you should be ball park in fit.

-- if you initial concern is "too small" then a 20mm longer stem would make the reach a few mm further than you are used to on your Cayo.

[LimboFR]

Hi guys, I really like the Collage CX Zero Evo. But I'm very confused about the size. I looked around on the internet and asked some cycling friends but i'm getting very different answers. I'm 188 cm tall with a 91cm inseam. Size recommendations vary from the 56s to 60s. I believe the 60s doesn't even exist...
Would like your advice and explanation. Thanks