BGM 60 x 110 Crankshaft

bgm PRO Competition crankshaft: 60 mm stroke & 110 mm conrod for Lambretta

The bgm PRO Competition crankshafts stand for top manufacturing quality, proven engineering – and in this version, precise performance optimisation with 60 mm stroke and 110 mm conrod. Based on the renowned bgm PRO crankshaft, this model has been further developed with numerous technical enhancements.


What’s new:

• Precision-ground press fits for maximum durability and torsional strength
• Newly coated and finely ground crankpin
• Robust forged conrod with CNC finish – now with 110 mm length
• Optimised bearing and seal seats: hardened and finely machined
• Wider variety of stroke/conrod combinations – ideal for tailored engine setups
• 100 % quality control by ISO- and QC-certified production partners

What remains:

• Solid full-circle design for increased pre-compression
• High-quality forged crank webs
• Excellent smoothness thanks to smart balancing with copper and tungsten weights
• Large lubrication slots in the small-end bearing for reliable oil supply
• Crankpin diameter: 22 mm

With over 15 years of experience and three more years of dedicated development, this crank delivers exceptional stability – even with longer stroke and conrod – making it the perfect match for performance-tuned Lambretta engines.

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!”