benbaconlewis

I currently ride a 58 Trek frame (2007 Madone 5.2) which fits fine. I am looking at a new frame with the following dimensions. I am worried it might be a little large for me. I will not be able to have a test ride prior to purchase, so any pointers you have would be very helpful. It is a good price, but I do not want to get the wrong size...

HEAD TUBE ANGLE 72
SEAT TUBE ANGLE 72
TOP TUBE LENGTH : EFFECTIVE 58.5
TOP TUBE SLOPE 0
HEAD TUBE LENGTH 18.4
BB DROP 8
CHAIN STAY LENGTH 43
SEAT TUBE LENGTH 61
STAND OVER HEIGHT 86
FRONT CENTER 60.6
FORK RAKE 45mm

Thank you very much in advance.

Ben

BananaTugger

What about you?

benbaconlewis

Sorry, I am 6ft and inside leg measurement of 32 inches.

nycphotography

What stem are you running on the Madone, how many spacers, how much seat post is showing, and how far is the seat set back?

Also the geometry of the Madone might help for those of us too lazy to go look it up.

benbaconlewis

I will take some photos when I get home tonight. Hopefully that will help.

Thanks for your assistance, I really appreciate it.

ps Trek website was down just now when I tried.

catfour

I posted this on another thread yesterday.

1) Go to https://www.bikesuperhub.com/bikefit/. Enter your body measurements and preferred saddle-to-handlebar drop. Get recommendations on your ideal bike size.

2) Click on "Transfer data to Rider's Preferred Setup" OR go to the "Rider's Preferred Setup" tab and enter the measurements from your current favorite bike.

3) Go to "Bicycle Geometry". Enter the geometry of a new bike here.

4) Go to "Stem, Headset Spacer and Seatpost". Click on the Calculate button. It'll suggest the proper stem length, spacer height and seatpost length for your new bike.

benbaconlewis

Thanks for the helpful tips catfour. I will check that out now.

With apologies for the delay, I attach some photos of my current set up below. If anyone can tell me if the frame dimensions in the original post will be too big for me, or about right, I would be very grateful.

Thanks in advance.

Ben

Kambei

Ben: I'm 6'2" with a 36" pubic-bone-to-floor inseam and I fit size 58-59 (ideally a 57.5cm top tube), so to me it sounds like the bike you're considering might be too big for you. But, you said the 58 Trek fits you and I'm no bike scientist, so....

Lizzylou

Hey, that's a pretty cool gadget, Thanks!

Dubbayoo

At the risk of sounding like a perv a pic of you on current bike would be more helpful.

nycphotography

It sounds to me like a 56 would be a better fit too.

But I'm no expert. Have you tried the program catfour suggested?

DirtPedalerB

SEAT TUBE LENGTH 61 and in the pic you have your stem flipped up on a 58 .. I think you know the answer here

Unagidon

In my opinion, most important is the top tube length, and to a lesser extent, the seat tube and head tube angles. Ultimately, you want to be able to achieve a similar reach to what you're currently riding.

Compare the measurements above to the Madone you're riding - if the angles of the ST and HT are the same, and even if the top tube measurements are slightly different, you can still adjust with your stem length.

benbaconlewis

Thanks all, very helpful (especially catfour's program).

OCRider2000

Assuming you don't want any more saddle to bar drop it would appear that your current bike's head tube is too short for you.