Tyre for a Mountain Bike, Does Different ETRTO Work?

RSmith on 17/02/2021 - 14:26
Last edited 17/02/2021 - 14:36

Hi,

Need to replace tyres on my bike and the current size of tyre is 29 x 2.10 54-622.

Saw this tyre on Pushy's https://www.pushys.com.au/maxxis-crossmark-29x2-10-mtb-tyre.…. The ETRTO says 52-622. Would this fit on my current bike?

Thanks

Comments

Porker on 17/02/2021 - 14:32

+1

29 (inches) is wheel size / (outside) diameter and 2.10 (inches) is tyre width.

You're getting the same sized replacement tyre based on your provided specs.

54-622 is 54mm tyre width and 622mm inner tyre diameter.
- RSmith on 17/02/2021 - 14:37
  
  Sorry, a typo. The pushys one is 52-622.
  - Porker on 17/02/2021 - 14:37
    
    +2
    
    Yes, I just checked the listing after the unusual post and also saw 52mm (52-622). It'll be fine.
    
    The rim / wheel width can influence the profile of the tyre when inflated. A 2mm difference won't make a big impact on the profile of the tyre.
    - RSmith on 17/02/2021 - 14:39
      
      Thanks a lot.
Euphemistic on 17/02/2021 - 18:19

+1

ETRTO is xx-yyy format where the tyre width is xx in mm and the inner diameter of tyre is yyy in mm.

yyy must match your rim diameter. xx can pretty much be anything within reason. On a mountain bike probably from 25-60mm

Old school 29” diameter relates to the outer diameter of the tyre, which changes with the tyre width, so a 29x2.1” tyre has a different diameter to a 29x2.5”, despite suiting the same rim diameter (622mm). Its an old school system before they standardised rim sizes and the overall diameter of the tyre made a difference to single speed gearing.