Reluctor Ring (toothed ring on drive shaft)

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CB
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Reluctor Ring (toothed ring on drive shaft)
I need a new reluctor ring (the toothed wheel on the RHS drive shaft that the speedo sensor reads from). Anyone : 1) got one spare 2) got a drive shaft with one on I can have 3) know where I can get one Chris
John Vine
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A bit of a thread resurrection, but did you ever find a source of new rings?  They seem to be rarer than unobtainium.

JV

CB
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I ended up getting one second hand. 

Whilst I was looking though, these guys https://exmol.com/ said they would be able to make one up. At the time the cost would have been £120 ex vat for 1, £75 each for 2, dropping via several steps to to £40 each for more than 10. 

John Vine
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Thanks for that.  You didn't happen to measure the ring, did you -- in particular, the I/D?

JV

 

CB
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the dimensions I had at the time were

43 teeth
internal dia. 73mm
outer dia. 93mm

But those come with absolutely no warranty at all - so use at your own risk...

John Vine
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Many thanks. 

For info, I asked CC yesterday what the I/D was (via "ask an expert" on the Parts site) and they replied just now with 71.4mm, so that matches pretty well.

JV

 

aerobod
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There is a possibility of using a standard ring (such as a Rover 43 tooth one) then having a plain sleeve machined to make up the difference in diameter between the ring I/D and driveshaft O/D.

James

Mechanical Moz
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#3 - Their sister site https://reluctorrings.com/ says if the car isn't listed by them and you're the first person to request one they'll make it for free.  

Worth an ask JV?

John Vine
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On the assumption that GKN make our driveshafts, I've asked them if they can supply the ring, and also provide measurements of the ring (I/D) and tripod tulip (O/D).  If/when I hear back, I'll post up details.

As was suggested here, maybe the 71.4mm is actually 2 13/16" converted?

Re #8: Thanks for the pointer - I'll follow it up.  But they do say "ABS" so they may baulk at the idea of a "speedo" ring.  Also, I guess I'll need to provide accurate measurements as well.

JV

Richard Price
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I measured up a few tripode drive shafts a few months ago to make up some trigger wheels for traction control.

The rings I had laser cut at 72.6mm diameter fit all of the shafts I've tried them on.