A bike fit question for Mike from a bike customer:
Hey Mike,
I am trying to figure out the sizing on an Orbea frame; also, the frame I have is 54cm but their new frames are odd number sizes. Without seeing my fit, should I go down or up?
Thanks!
R
Dear R,
For frame size I would suggest looking at your current bike's Top Tube Length first. If you are very pleased with your fit and have minimal aches and pains, use this measure as a guide. (Note: on a Euro Built bike that should be about 54 cm for your 54 Orbea. Next look at the Head tube length and if you are using an up-turned stem or a level one. The other consideration is if you want a "Performance" or "Comfort" fit. Comfort has a shorter Top Tube and taller Head Tube for a more upright position, Comfort fit). That should help you to get started.
Mike
Thanks Mike for the input and advice.
You put me in a performance fit and I am ok with it. Still not sure how to equate my 54 cm top tube to either 53 or 55 cm sizes.
Yours truly,
R.
Dear R,
The reason I asked Performance or Comfort is because you purchased your bike over 5 years ago and a lot can change in this time period. Anyway, so if you’re in a performance position and you like it, determine the "effective Top Tube" length and determine the stem length to get overall Torso extension and back angle. If you use longer than a 12 cm stem the longer Top Tube and shorter stem would probably be the better choice. On the other hand if you use a shorter stem the longer Top Tube would be better. Double check the head tube on either bike so that it will be as close to the current position without adding excessive spacers or that the stem is resting on the headset.
Note: Look at it like this, eliminate the bike for a moment and think about you the rider and how your current position has you perched on your bike. Now as you add the bike frame and fit components use the sizes that replicate your current angles or position.
Hope this helps...
Mike (owner of "bad" Vision)
