Crankshaft -BGM Pro HPC Competition 58mm stroke, 107mm conrod- Lambretta DL/GP 125cc, 175cc, 200cc, 225cc, 250cc

bgm PRO Competition: Lambretta cranks on a new level

• Ground press-fit surfaces for maximum joint stability and maximum twist resistance
• Ground and coated crank pin
• Forged connecting rod with CNC finish
• Hardened and ground bearing and seal seats
• Wider range of stroke and rod combinations than before
• Quality control of each individual crankshaft through 100% testing by an ISO and QC certified manufacturer

• Full-circle crank for increased pre-compression
• Forged crank webs
• Low-vibration engine operation thanks to sophisticated balancing with hidden pockets, copper and tungsten counterweights
• Lubrication of the lower connecting rod bearing via two large oil slots
• Crank pin diameter 22 mm

The bgm PRO Competition cranks combine 15 years of experience. Optimization included an additional three years of development and testing to realize a crankshaft that offers maximum twist resistance and durability.


Also recommended by Mark Broadhurst, MB Scooters, February 2025:

“Today we have purpose made full circle cranks that are full circle made from solid metal, with various balancing pieces pressed in place to keep the higher compression and try to get a better smoother balance. (…) BGM got it right, they were super tight, so tight they take 15 tons to press together, moving them is very difficult and it is full circle and balanced very well – these are our go to crank – when available!”

Source: mbtechsite.co.uk/portfolio-items/tuning-work-transfer-casing-tuning/

In the British BSSO race series, Team Replay entered the 2018 season with numerous bgm parts – including the new and improved bgm crankshaft. Replay rider Darren Conneely took second place in Group 4.