Road bike frame sizeing

[KaKa]

I am 1.72m tall, my inseam is 83cm

 

what would the size of a compact frame be

[AndreZA]

Seeing that you are looking for a compact, then inseem has nothing to do with sizing. Torso and arm length the best to go by then. I would say you should look at a small or about 46-48cm.

[Tiny K]

do a search on the hub - there was a topic re seat height or something like that

 

you don't get compact frame, only compact groupset (afaik) - but you can always go one size smaller in frame

[gummibear]

In some makes a medium and in some a small.

 

Look at the effective top tube length,it should be about a 53 to 54 cm.

[AndreZA]

do a search on the hub - there was a topic re seat height or something like that

 

you don't get compact frame, only compact groupset (afaik) - but you can always go one size smaller in frame

 

Yes you do, all frames with sloping top tubes are commonly know as compact frames.

[bikemonster]

I am 1.72m tall, my inseam is 83cm

 

what would the size of a compact frame be

 

I am 1.7m tall, which may explain many things, and I ride a Small.

 

Bu-u-u-u-u-t, different manufacturers may have slightly different sizing.

 

Start by finding a sizing chart on your chosen manufacturer's website and take it from there.

 

My advice, which is worth exactly what you've paid me for it, is to go for a smaller frame if you are on the cusp in a sizing chart.

[DaLoCo]

I am 1.7m tall, which may explain many things, and I ride a Small.

 

Bu-u-u-u-u-t, different manufacturers may have slightly different sizing.

 

Start by finding a sizing chart on your chosen manufacturer's website and take it from there.

 

My advice, which is worth exactly what you've paid me for it, is to go for a smaller frame if you are on the cusp in a sizing chart.

 

At 1.75m I suspect i might actually be a little more comfortable on a small bike, mine is a 54cm. I base this on the fact that I have some significant shoulder pain and back pain after a ride. I suspect I am placing too much weight on my arms, because the handlebars are too far forward.

 

I have thought of movng the saddle forward, but that might influence the position of my legs..

[bikemonster]

I have thought of movng the saddle forward, but that might influence the position of my legs..

 

Ya think????

 

Apologies to the OP for the minor hijack, but DaLoCo, you could try a shorter stem. The rule of thumb is that the bars should obscure (or "occult" for any astrologers reading this) the hub of the front wheel.

 

The KOPS (knee over pedal spindle) saddle placing has been debunked by Keith Bontrager I think it was. His question was along the lines of "Oh, yeah? How does that work for recumbents then?"

 

At least moving your saddle is free...always a good thing!

[AndreZA]

At 1.75m I suspect i might actually be a little more comfortable on a small bike, mine is a 54cm. I base this on the fact that I have some significant shoulder pain and back pain after a ride. I suspect I am placing too much weight on my arms, because the handlebars are too far forward.

 

I have thought of movng the saddle forward, but that might influence the position of my legs..

 

I am 1.88 and I'm on a 52 compact (56 normal) and had to put a 90mm stem on instead of my normal 100mm. A roadbike's top tube should be about 20-30mm shorter then a MTB's.

[Mongoose!]

A roadbike's top tube should be about 20-30mm shorter then a MTB's.

 

Naa, if you want back pain yes

[Barend de Arend]

At 1.75m I suspect i might actually be a little more comfortable on a small bike, mine is a 54cm. I base this on the fact that I have some significant shoulder pain and back pain after a ride. I suspect I am placing too much weight on my arms, because the handlebars are too far forward.

 

That (too long stem or toptube) doesn't place more weight on your arms, but it makes the arms less likely to be able to support that weight, because they're not rotated the way they should be. Your shoulders should be next to your chest, not on top, and your elbows pointed downwards (almost -- look at how they are when you stand)

 

Things to check: Do you roll your arms forwards and inwards at the shoulders? ie. you roll your shoulders towards your head, and the elbows out? Then the handlebar is too far forwards.

 

Another possible problem is too-wide handlebars. Your handlebars should be as wide as your shoulders.

 

You can compare it with doing push-ups with your hands in front of your shoulders, vs. below you, and your hands too wide. Try it -- it's hard.

 

And no, don't move your saddle forward to compensate. Get the saddle in the right place first.

[Barend de Arend]

Yes you do, all frames with sloping top tubes are commonly know as compact frames.

 

Exception that proves the rule:

 

Cannondale have sloping tubes on the very small frames (lower at the seatpost) and opposite slopes on the very large frames (higher at the seatpost) They aren't compact frames.

[Tankman]

I am 1.72m tall, my inseam is 83cm

 

what would the size of a compact frame be

 

There is more to it than height and inseam

 

DIY Fit Calculator

 

I think it gives you compact sizing in the end.

Go through all the measurements and this will give you a pretty good indication.