Chainrings and Drive Sprockets
A drive is efficient when chain and chainring work together perfectly. The most important factor here is an optimum form and force fit, which is created by a minimum of play between the drive components. Precision is the central KMC issue in the development of advanced drive components. For the Bosch Gen4 chainrings, for example, we have designed a completely new tooth profile: It prevents the chain from falling off without forcing it onto the teeth. The result is the perfect balance of power and smooth running with a long service.
Bosch BDU38/34, 34T, 11/128“ Narrow-Wide, CL 55 mm**NEW!** Direct mount chainring with narrow-wide tooth profile for a secure chain retention. 34T with chainline 55 mm, quality steel. Part of KMC's 3,500km+ programme. Bosch BDU38/34, 38T, 11/128“ Narrow-Wide, CL 50 mm**NEW!** Direct mount chainring with narrow-wide tooth profile for a secure chain retention. 38T with chainline 50 mm, quality steel. Part of KMC's 3,500km+ programme. Bosch BDU38/34, 38T, 11/128“ Narrow-Wide, CL 47.5 mm**NEW!** Direct mount chainring with narrow-wide tooth profile for a secure chain retention. 38T with chainline 47.5 mm, quality steel. Part of KMC's 3,500km+ programme. Shimano Steps EP, 34T, 11/128" Narrow-Wide, CL 55 mm**NEW!** For Shimano Steps EP systems, narrow-wide tooth profile for a secure chain retention, 34T with chainline 55 mm, direct mount, quality steel. Shimano Steps EP, 38T, 11/128" Narrow-Wide, CL 47.5 mm**NEW!** For Shimano Steps EP systems, narrow-wide tooth profile for a secure chain retention, 38T with chainline 47.5 mm, direct mount, quality steel. Shimano Steps EP, 38T, 11/128" Narrow-Wide, CL 50 mm**NEW!** For Shimano Steps EP systems, narrow-wide tooth profile for a secure chain retention, 38T with chainline 50 mm, direct mount, quality steel. BCD104, 38T, 11/128“ Narrow-Wide, AL7075 T6Chainring 38T for 4-arm spiders with BCD 104 mm, CNC milled in Europe from AL7075 T6, narrow-wide tooth profile BCD104, 38T, 1/8“ Wide, AL7075 T6 Wide chainring for 4-arm spiders with BCD 104 mm, CNC milled in Europe from AL7075 T6, part of the KMC 10,000km+ program. BCD104, 42T, 1/8“ Wide, AL7075 T6Wide chainring for 4-arm spiders with BCD 104 mm, CNC milled in Europe from AL7075 T6, part of the KMC 10,000km+ program. BCD104, 34T, 11/128“ Narrow-Wide, Steel**NEW!** Chainring 34 teeth for 4-arm spiders with BCD 104 mm, narrow-wide tooth profile for a secure chain retention, quality steel. BCD104, 38T, 11/128“ Narrow-Wide, Steel**NEW!** Chainring for 4-arm spiders with BCD 104 mm, narrow-wide tooth profile for a secure chain retention, quality steel. Bosch Gen 4, 42T, 11/128“ Super Narrow, CL 47.5 mm **NEW!** Direct mount chainring with 42 teeth and 47.5 mm chainline for narrow chains 11/128“ or 3/32. Made of quality steel. Part of KMC's 3,500km+ programme. Bosch Gen 4, 42T, 11/128“ Super Narrow, CL 52 mmDirect mount chainring with 42 teeth ans a 52 mm chainline for narrow chains 11/128“ or 3/32. Made of quality steel. Part of KMC's 3,500km+ programme. Bosch Gen 4, 38T, 11/128“ Super Narrow, CL 47.5 mmSpacerless direct mount chainring 38 teeth with 47.5 mm chainline for narrow chains 11/128“ or 3/32. Made of quality steel. Part of KMC's 3,500km+ programme. Bosch Gen 4, 38T, 11/128“ Super Narrow, CL 52 mm Spacerless direct mount chainring with 38 teeth and 52 mm chainline for narrow chains 11/128“ or 3/32. Made of quality steel. Part of KMC's 3,500km+ programme. Bosch Gen 4, 40T, 11/128“ Super Narrow, CL 52 mm Spacerless direct mount chainring 40 teeth and 52 mm chainline for narrow chains 11/128“ or 3/32. Made of quality steel. Part of KMC's 3,500km+ programme. Chainguard for Bosch Gen 3Chain guard for KMC chainring Bosch Gen 3 Chainguard for Bosch Gen 4 Spacerless ChainringsChain guard for KMC chainring Bosch Gen 4 spacerless Bosch Gen 3, 38T, 11/128“ Super Narrow, CL 47.5/50 mmDirect mount chainring with 38 teeth and chainline 47.5 or 50 mm for narrow chains 11/128“ or 3/32. Made of quality steel Part of KMC's 3,500km+ programme. Bosch Gen 3, 44T, 11/128“ Super Narrow, CL 47.5/50 mmDirect mount chainring with 44 teeth and chainline 47.5 or 50 mm for narrow chains 11/128“ or 3/32. Made of hardened chromoly steel and part of KMC's 3,500km+ programme. Bosch Gen 2 Super Narrow, 15TChainring with 15 teeth for narrow chains 11/128“ or 3/32. Made of hardened chromoly steel. Part of KMC's 3,500km+ programme. Bosch Gen 2 Super Narrow, 18TChainring with 18 teeth for narrow chains 11/128“ or 3/32. Made of hardened chromoly steel. Part of KMC's 3,500km+ programme. Bosch Gen 2 Super Narrow, 19TChainring with 19 teeth for narrow chains 11/128“ or 3/32. Made of hardened chromoly steel. Part of KMC's 3,500km+ programme. Bosch Gen 2 Super Narrow, 20TChainring with 20 teeth for narrow chains 11/128“ or 3/32. Made of hardened chromoly steel. Part of KMC's 3,500km+ programme. Bosch Gen 2 Super Narrow, 21TChainring with 21 teeth for narrow chains 11/128“ or 3/32. Made of hardened chromoly steel. Part of KMC's 3,500km+ programme. Bosch Gen 2 Wide, 18TChainring with 18 teeth for wide chains 1/8“. Made of hardened chromoly steel. Part of KMC's 10,000km+ programme. Bosch Gen 2 Wide, 19TChainring with 19 teeth for wide chains 1/8“. Made of hardened chromoly steel. Part of KMC's 10,000km+ programme. Bosch Gen 2 Wide, 20TChainring with 20 teeth for wide chains 1/8“. Made of hardened chromoly steel. Part of KMC's 10,000km+ programme. Bosch Gen 2 Wide, 21TChainring with 21 teeth for wide chains 1/8“. Made of hardened chromoly steel. Part of KMC's 10,000km+ programme. Crankarm ISIS 175 mmCrank arm for Bosch Gen 4 made of aluminium for the ISIS standard, 175 mm length, left and right, screws included. Crankarm ISIS 170 mmCrank arm for Bosch Gen 4 made of aluminium for the ISIS standard, 170 mm length, left and right, screws included. Crankarm BNI 170 mmCrank arm for Bosch Gen 3 made of aluminium for the BNI standard (Bosch Spindle Interface), 170 mm length, left and right, screws included.
