With a fresh new design, Crupi chainrings are better than ever!  CNC machined from 6061-T6 aluminum plate right here in the USA.  Machining rather than stamping our rings ensures that each gear is perfectly round and flat.  This helps eliminate tight and loose spots in your chain. Crupi rings have been the best on the market for nearly 15 years now!  

available in sizes 45t -51t

With the many gear sizes Crupi offers, we thought it would be good to offer you the most complete gear ratio charts available!

You can download and print any of these charts in a PDF format.

20 x 1-1/8 with 20 x 1" Tires              20 x 1.75 with 20 x 1.75 Tires

20 x 1-1/8 with 20 x 1-1/8" Tires             24 x 1-1/8 with 24 x 1-1/8" Tires

20 x 1-1/8 with 20 x 1-3/8" Tires            24 x 1.50 with 24 x 1.50 Tires       

20 x 1-3/8 with 20 x 1-3/8" Tires           24 x 1.50 with 24 x 1.75 Tires

20 x 1.50 with 20 x 1.50 Tires                  24 x 1.75 with 24 x 1.75 Tires