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MrB Bay

M8 X 45mm Allen Cap High Tensile Steel
£ 0.38 £ 0.48
( Ex Vat: £ 0.40 )
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47 tooth 4 / 5 / 6 plate lightened crownwheel, MRB


We were so disappointed with the standard of available sprockets that we decided to have our own made.

They are made in the UK to a very high standard.

They are designed to be used with the more reliable Li, Sx type clutch bearings rather than the GP style bush.

This sprocket can work with 4 / 5 plates or 6 plate internal type clutch conversions and has 47 teeth.

Designed by Mark Broadhurst and MRB

 47 tooth 4 / 5 / 6 plate lightened crownwheel, MRB
  • 47 tooth 4 / 5 / 6 plate lightened crownwheel, MRB
  • 47 tooth 4 / 5 / 6 plate lightened crownwheel, MRB
MRB0675K
£ 97.81
Price: £ 81.51 Ex Vat
   Quantity :


 

 

1. MRB0751K Clutch pressure plate (flange) inner bell, MRB £ 80.92 (Ex vat price: £ 67.43)

This is MRB new CNC clutch pressure plate (flange) to suit ALL clutch assemblies using internal extended spiders.    It is extended longer...Clutch pressure plate (flange) inner bell, MRB Add :
 
 

2. MRB0757 MB Clutch spider (4 / 5 / 6 / 7 plate) MRB £ 161.65 (Ex vat price: £ 134.71)

This is our new one piece clutch spider to suit all types of 4, 5, 6 or 7 plate internal...MB Clutch spider (4 / 5 / 6 / 7 plate) MRB Add :
 

 

Features

  • Light weight with hardened clutch bearing bush so improved needle roller bearings can be used.
  • Machined deeper so 4 or 5 or 6 plates can be fitted and helps prevent clutch drag.
 
 

Technical

  • Designed by Mark Broadhurst.
  • Made in the UK using modern steels, lightened and precision CNC machined.
 
 

Development History

  • Fed up of poor inferior products we designed our own.
  • What ever product was used extra machining and grinding was required.
  • The precision of the crown wheel is very important for chain and clutch life.
 
 

Reasons to Buy

  • Lightweight.
  • Strong.
  • Hardened.
  • Precision machined.
  • Adjustable lift.
  • No rock.
  • Easy fit.
 
 

Tips

  • Always dial gauge the crown wheel with the front drive sprocket to improve chain life.
  • Always check sprocket lift and shim up to suit.
  • Always fit new end plate bearings and clutch needle bearings.
  • Make sure both clutch friction, steel, pressure plate fit and slide up and down freely.
  • Always soak clutch plates in ST90 for 24 hours before fitting.
  • Steel tabs on top and bottom friction plate can be bend 20 degrees to aid the clutch.
  • Always use a clutch holding tool to tighten the clutch nut.
 
 

5 star 1. Kevin H 28 Jul 2008 

Excellent quality part. Very light weight compared to the standard sprocket and less turning friction now that the GP clutch bush is replaced by bearings.

 
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Ask a Question?

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Peter w on 25 Apr 2009 asked "Hello Guys, Could this crownwheel be used with one of your billet spiders to make a 6 plate clutch? And if so what thickness plates and steels will i need and which thickness top plate will be needed? Thanks for your time.Pete"

MB Group, Serious Outdoors Ltd replied: You can not use this crownwheel with our existing 6 plate external spider.

But we have in production our new solid spider that is designed to work with this crownwheel and also have a new extended clutch flange to work with the kit.

(this are on stock).

When the kit is available you can use: 5 standard Surflex plates, with 1 or 12mm clutch steels.

Or 6 green/red plates.

You can use any top plate and use our normal clutch springs.

 


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