Time Trial set up - stem size?

mroli
mroli Posts: 3,622
edited July 2010 in Workshop
Hi - I want to buid up a TT bike and I have no idea about what I am supposed to do in relation to sizing!

I normally ride a 55.5 top tube bike with a 120 stem (saddle in presumably a "standard" position).

Now, if I was riding a similar size TT bike, surely I would need a shorter stem as my elbows are effectively going where the middle of my forearms would be on my road bike?

Or is that the point, by leaning so much further forward, I am going to be more aero?

I know it will take some playing around - but I just wondered if there was a rule of thumb on this sort of thing?

Thanks very much

M

Comments

  • hopper1
    hopper1 Posts: 4,389
    Usually use a smaller frame!
    Start with a budget, finish with a mortgage!
  • Monty Dog
    Monty Dog Posts: 20,614
    Usually 2-3cm shorter and as low as you can go - when your thighs hit your chest is usually low enough! Maybe worth getting an adjustable stem and you can adjust your position as your flexibility improves. Sliding the saddle forward also helps to open-up the angle between your thighs and torso too. Ideally, forearms flat, elbows at 90 degrees and in front of knees.
    Make mine an Italian, with Campagnolo on the side..
  • mroli
    mroli Posts: 3,622
    Frame will work out a bit smaller I think.

    Thanks Monty - good tips.

    Ta both...