SIDI London Insulated Insoles - Gray/Blue 45 MFPN=MS (L) 165MM AA The number and letter refer

The number and letter refer to the mm offset and direction from the mounting face to the centerline of the teeth:

The oversized caliper fingers easily clear virtually any tire eliminating the need to remove the tire for truing which is especially useful for tubeless setups

The 10mm bar allows for use with many different types of panniers

Forged 7050 aluminum 30mm BB392EVO spindle is strong and lightweight

Impact-resistant toe box Cleat Bolt Pattern 2-Bolt Closure Lace Gender/Age Men's Color Core Black/Red/FTWR White Shoe Size (US) 4 Defined Color Black Activity Cycling

SIDI London Insulated Insoles - Gray/Blue 45 MFPN=MS (L) 165MM AA The number and letter referSIDI London Insulated Insoles are designed to provide warmth and comfort in cold weather cycling conditions. These insoles feature an insulated design that helps retain heat keeping feet warm during rides in chilly temperatures. Made from high quality materials they offer cushioning and support ensuring a comfortable riding experience even in cold weather. Ideal for cyclists seeking additional warmth and insulation for their feet during winter rides.