bikefitcm

I am trying to find my bike frame size and reach(center of seat to handlebar)
I have measured my inseam and used the Lemond chart to get frame size and
The “top of seat to bottom bracket”. This seems to work ok.
To get my reach, I measured my torso(crotch to v below neck) and my arm
Length(shoulder to center of palm), and used a formula I found on the
Internet
Total Reach =((Torso Length+ Arm Length)/2) + 10.16cm = (Effective Top Tube + Stem)
Where effective top tube is the measurement from the center of the seat to
The handlebar

This formula gives a reach that is too long (about 7 cm) My question is does anyone
Know where this formula came from? I first found it on the Sierra Trading Post site.
I called them and they said they had not sold bikes in 10 years and had no idea
Where the formula came from. I am looking for a formula that would translate
The torso and arm measurements to the “total reach” on a bike.
Thanks

pacificaslim

Try the complete fit calculator at competitivecyclist.com. It'll give you all you need to know.

NormanF

What's your height and inseam? I'm 5'7" with 30 inseam and in a road bike size, 54 cm is spot on for me and in a 29er, I take a 17" inch.

bikefitcm

Thanks for the comment. I will look at Competitive Cycle site.

bikefitcm

Norman - I am 6 ft and ride a 58

NormanF

This sizing chart will make fitting easier - but be aware every bike manufacturer may size their bikes somewhat differently. Use it as general guideline to find your next bike:

bikefitcm

Norman
Thanks for the info, but this says nothing about "total reach", which is the problem.
I think that the Lemond chart gives me the correct frame size.

ltxi

With a circa 32" inseam, I normally sit a 58 TT frame. Beyond that it's a matter of adjusting stem height and length to meet my druthers/personal riding style. Don't get too all wrapped around the axle with fit charts and theoretical precision measurements. One size does not fit all. Get a correctly sized frame and then adjust the saddle, seatpost, and stem bits to suit.