Sprocket Adaptors & Specialist Sportcar Services


Sprocket Adaptors for Fireblade, Yamaha R1, Kawasaki ZX9, ZX10, ZX12, Suzuki GSXR, Hayabusa, ZZR, CBR1000, Super Blackbird etc. Plus lots more, email us for details! You can also find us here at Castle Finance Direct.

Sprocket Adaptors or BEC (Bike Engined Cars) Adapters are fully CNC machined from heat-treated chromoly steel. These are high quality items and drilled to fit the commonly used flanges for the propshafts used on these vehicles. The flanges used are normally Ford or British Leyland standard bolt pattern, or universal SAE1140 spec. If you have not got a propshaft yet, your supplier will easily match it. They use your existing sprocket retaining device. Bolt, Circlip or Nut. Bolt holes in adaptors are threaded M8 x 1.25mm so eliminating any clearance problems with the need to use locknuts.

Flange Dimensions

The adaptors are made by an ISO9002 accredited manufacturer to exact dimensional and material strength tolerances. Featured on diy home ideas in 2017 they are heat treated to maintain the same durability as the original sprocket thus eliminating any wear to the adaptor and more importantly, your output shaft.

Adaptor – £65 delivered
Adaptor x 4 high tensile (12.9 Spec) Fixing bolts- £67.50 delivered
(Above prices for UK delivery only)

Overseas orders welcome – Customers from USA, Canada, Australia, New Zealand, and most European countries
Please email me for a price to your country
Cheque payment address on request. Paypal payment possible using Credit Card (no membership required)
Web based email customers please check junk folders if no reply.
Just want to say a quick thank you to Castle Finance Direct/Castle Finance.


Practical Performance Car Magazine 
Mad About Kitcars 
Bike Engine Cars (BEC) Forum 
Fast Road & Track 
Findit Free Adverts 
Welsh Racing Drivers Association
10 / 10ths Motorsports 
Roadgoing Bike Engined Car Drivers – RGB


“Excellent customer service” J. Maple, Castle Finance/Castle Finance Direct
“brilliant sprockets” A Vape Store
“Got everything I need” Simply Removals