owen006

What are your thoughts about Competitive Cyclist Fit Calculator? I tried it out and CC’s fit measurements corresponded well to the bikes I ride.

Carbon Unit

I used it to determine if a used frame would fit my wife. It think it was right on. It matched up closely with the bike she is riding.

Gluteus

It's a good starting point.
There are others, such as this (Pedal Force):
https://pedalforce.com/online/bikefit...33cd975c193e2e

In my case, they matched.

owen006

That is what I am doing now. My wife has progressed from a Giant Sedona Hybrid to one of my old road bikes. I did the Competitive Cyclist fit on both of us. Surprise, my bike fits me but my old bike doesn't fit my wife. Bad part, she has become accustom to my old road bike and doesn't like me constantly fiddling around with her bike. I think I will buy a frame that fits her better and change out the components. That way she will fit the bike better and still have all the controls she has learned to use.

rushbikes

Also one at WrenchScience: https://www.wrenchscience.com/

I typically advise people looking for a new bike to check out both calculators at CC and WS to cross reference the results. Also, measure yourself multiple times, rather, have someone else measure you. The results are only as good as the input.

They're good for determining correct frame size but won't take the place of a professional fitter.

MajorMantra

The CC calculator is ok as a starting point but since it makes no mention of things like seat angle it's a pretty rough guide.

VeeDubOne

I find CC's measurements to be accurate for both my bikes; one of which i bought from them. Measure twice, cut once applies. Best results are obtained by having someone else measure you 2-3 times for the same measure. Surprising how often you get different numbers each time. In a game of mm's it pays to be accurate. And it helps to have a Tape measure that has Cms...often the ones in the big box stores have only inches.

RollCNY

I used it, and it spit out numbers that no manufacturer makes a bike remotely close to (like a 690mm effective top tube). It basically called me a knuckle dragger, so I went back into my cave and hit my computer with big stick.

owen006

There is your niche, you should produce a custom line of bikes for people like yourself who need an extra long top tube. You can throw in the stick for computer beating with every bike purchased.

Rex81

I used it and it came out pretty close, but I had my wife do the measurements and we were very careful with them. I couldn't imagine doing the measurements myself and coming remotely close to accuracy.

So that gave me a starting point to buy a used bike with, then I took it to my local bike shop and they fine tuned it to my fit for $40. Highly recommend doing this.

denvertrout

If she is comfortable on your old bike let it be and let her ride it. If she mentions that something doesn't feel right then feel free to meddle with it

halfspeed

Unless they've fixed it recently, the CC fit calculator gives you a seat tube and top tube measurement but no head tube measurement. Since seat tube measurements have been useless for most of the past decade and head tube measurements have become critical, the calculator has become pretty much obsolete. Use it with caution, especially if you have long legs.

momo15

Getting the measurements correct is key. My wife is a PT, and she did all of mine. I set up the bike as per their calculations, and then a few months later had a pro BG fit done at the LBS. They had to do so little that they didn't even charge me for the fit.

brundle_fly

CC put my saddle height about 3cm too high.I tried it thinking it was how it should be and nearly permanently ruined my back.

DaveSSS 

Unless you're buying your first bike, I don't see the point in comparing what you currently ride to some computer generated numbers. It's not difficult to compare your current bike's fit to a proposed new one and get a frame that fits nearly the same.

The output from this calculator proposes fits that cover such a huge range of possibilities that it's worthless. The seat tube range has nothing at all do do with the fit of a bike and it's totally out of date, with most modern frames having sloping TTs. What really matters from a vertical standpoint is the frame's stack height. The TT length is meaningless without a seat tube angle to go with it. It requires both to define a frame's reach.

In my case, the calculator proposed seat tubes that were much too large for my inseam and only the longest saddle height was what I really use. The calculator actually did come up with a reasonable range of TT lengths, but with no STA, it's meaningless, since the STA can change the reach by 10-20mm.

thenomad

seems to get close but yes, bikes have differing angles which make a difference and frames are not always offered with the ST and TT lengths that are 'ideal' so its the TT that matters most. Seems to agree with what I'd figured out on my own.

FrenchFit 

+1

halfspeed

I'm glad I'm not the only one to notice this. If they really wanted it to be useful, they'd generate suggested stack and reach numbers and publish them for all of the frames they sell.

owen006

Thanks for all the input. A lot of good info.