BGM PRO Item number: BGM11060N
BGM PRO
1 Rating
385,00 €*
available immediately
Shipping weight 3 kg

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!”

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


In the UK BSSO racing series, Team Replay entered the 2018 season with a range of bgm components – including the updated Competition crankshaft. Rider Darren Conneely secured second place in Group 4.




This is how we ensure, that reviews come from real consumers.
Anonym  06/18/2025
Ball bearing
Dimensions
16x20x20mm
 
Piston pin
Diameter
16 mm
 
Crankshafts
Stroke
60 mm
Thread on alternator side
M12x1,0 Linksgewinde
Thread on drive side
M8x1,0 Rechtsgewinde
Crank web diameter
95.9 mm
Crankcase must be spindled
nein
Motor housing must be modified
nein
Rotary vane crankshaft
nein
Full cheek crankshaft
ja
Filling material for full cheek
Stahl
Material balancing weights
Kupfer, Wolfram
Variomatic stub design
verzahnt
Wide crank webs
40.5 mm
Bearing seat diameter on alternator side
25 mm
Bearing seat diameter on drive side
25 mm
Diameter of sealing ring seat on alternator side
33 mm
Diameter of sealing ring seat on drive side
33 mm
 
Connecting rod
Connecting rod length
110 mm
Connecting rod strength
7 mm
Connecting rod eye top diameter
20 mm
Lifting pin diameter
22 mm
Upper connecting rod eye lubrication hole
ja
Lower connecting rod eye lubrication hole
Schlitz
Clevis pin bearing
Silberkäfig
Connecting rod thrust washers
ja
 
OEM numbers (for comparison purposes only)
Scooter Center:
BGM11060N
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