Racing Chain by Regina 520 pitch, 124 links, WSBK version for BMW S1000RR/HP4. The Regina racing-chain with 520 pitch saves 0.5 kg weight compared to the stock 525 chain. Additionally, it is longer to allow for a longer wheelbase and larger rear sprocket. Weight: 2.04 kg. Note: for example, an OEM gear ratio of 17/44 requires a chain length of 118 links.