Bike Sizing – the importance of Stack & Reach

Bike Sizing – the importance of Stack & Reach

So here’s the thing …

  • Boardman AirTT size L (their biggest frame) Stack 530, Reach 450
  • Cervelo P2 size 56 (3rd from largest) Stack 531, Reach 429
  • Specialized Shiv size M (yes ‘medium’) Stack 540, Reach 405 …  (yes, this stack is higher than the other 2 examples, but the next nearest stack in the Shiv range is size S at 515; THEIR ‘XL’ has a Stack of a veritable mountainous 590 and yet the reach STILL stands shorter than that of the Boardman at 445).

Without the benefit of a bike-fit giving you information about the geometry of your own body IN ACTION (your standing height and arm span tell you nothing about your potential for comfort when creating the ‘pyramid’ of road, or the ‘L’ of tri), which bike would you have gone for?

‘Which Bike?’ Considerations …

  1. If you stick to conventional sizing, it’s guesswork; in these examples it’s a stab-in-the-dark of the +£2K variety.
  2. By delving into the Stack & Reach – more informative sizing system – you can see that each manufacturer displays different geometry characteristics; here, for a similar ‘height’ of bike, the Boardman is ‘longer’, the Specialized is ‘shorter’ and the Cervelo sits in the middle.
  3. And that process of looking at the ‘geometry’ of a bike, rather than the ‘size’ of the bike via very basic nomenclature, highlights glaring gaps in the progressive size charts for certain brands.

The conclusion?

If you’re not assessing, you’re guessing, and these guesses can be expensive.  The F.I.S.T. bike fit protocol assesses and generates the data you need to remove the guesses.

3 minutes here shows you how.