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  # 1  
Old 05-04-16, 16:20
Shaolinfist Shaolinfist is offline
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Aluminium sprocket wear

Hi guys, so I fitted a renthal aluminium sprocket just over 1200 miles ago and this is how it looks already...



I have a scottoiler and as you can see there is plenty of oil getting on the teeth after a ride



There are also aluminium shards on the chain which i found by wiping my finger on it. Is this normal wear? Should I be concerned?

Thanks in advance!
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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights
  # 2  
Old 05-04-16, 17:14
Pleiades Pleiades is offline
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Generally hard anodised 7075-T6 aluminium sprockets last half as long as good quality steel sprockets. I would suggest that the sort of wear you're experiencing is very definitely abnormal. There is no way even an aluminium sprocket should hook up like that in just 1200 miles; even on a poorly maintained bike or one ridden in sand you'd expect to get more life out of it than that. It must by a duff sprocket or maybe even a fake Renthal of which there are quite a few being leaked on to the market at the moment by unscrupulous ebay sellers.

I take it your chain is OK and not stretched?
  # 3  
Old 05-04-16, 17:37
Shaolinfist Shaolinfist is offline
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Thanks for the quick reply Pleiades. I just jacked up the rear wheel to double check and the chain is still in the correct adjustment (around 50mm) with no tight spots. I purchased the kit from B & C Express who seem to have a good reputation. I regularly check the chain for lubrication and keep my scottoiler topped up. Also the front sprocket shows no sign of wear. I do drive pretty hard opening the throttle quickly and doing 100+ mph from time to time but still that's what these things are made for right?
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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights

Last edited by Shaolinfist; 05-04-16 at 17:46.
  # 4  
Old 05-04-16, 21:25
Pleiades Pleiades is offline
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Quote:
Originally Posted by Shaolinfist View Post
Thanks for the quick reply Pleiades. I just jacked up the rear wheel to double check and the chain is still in the correct adjustment (around 50mm) with no tight spots. I purchased the kit from B & C Express who seem to have a good reputation. I regularly check the chain for lubrication and keep my scottoiler topped up. Also the front sprocket shows no sign of wear. I do drive pretty hard opening the throttle quickly and doing 100+ mph from time to time but still that's what these things are made for right?
If you bought it from B&C then it'll be genuine, so we can rule a fake sprocket out. Personally I would contact them and show them you photos and see if you can wangle a replacement out of them. There's a small chance you've got a duff one that missed out on the hardening or anodising process. I would expect to see at least 6000 miles out of a Renthal aluminium sprocket and even then I wouldn't expect it to look as bad as yours does at the moment.

Quote:
Originally Posted by Pepsi View Post
The answer is in the word 'aluminium' ....Funny how chains aren't made of the stuff ....hardened or otherwise!
I don't think his problem is down to the fact it's aluminium. Yes, you can expect half the mileage of a steel sprocket, there's no dispute that they don't last as long, but 1200 miles is plain ridiculous!
  # 5  
Old 05-04-16, 23:30
Shaolinfist Shaolinfist is offline
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Thanks Pleiades I will contact them and see what they say. I can't see any reason why it would wear so quickly especially as the other sprocket and chain are just fine. I too expect much more from renthal as they have a good reputation for making sprockets.

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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights
  # 6  
Old 06-04-16, 17:26
Shaolinfist Shaolinfist is offline
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OK so I spoke to B&C Express and they said that just by looking at the hooking on the teeth they have determined that the chain is too loose. I argued the point with them that actually it is within the manufacturers specifications and they eventually agreed that if I send it back to them they will have a look at it and if necessary send it back to renthal for inspection but that it is unlikely that they will come to any other conclusion. I am pretty disappointed at this response and have never heard of a loose chain causing this kind of wear. They did sell me a new steel JT sprocket with free postage so that I can replace the renthal one which is a small consolation. Hopefully I will have better luck with that one.
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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights
  # 7  
Old 06-04-16, 18:48
Pleiades Pleiades is offline
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Not so sure about it being caused by a loose chain? Even if it was I still wouldn't have expected it to hook that badly in 1200 miles.

Still worth enquiring though. Might be worth contacting Renthal directly and see what they say - after all, they do have a reputation to up hold. You never know, you still might get a refund from B&C down the line if it does turn out to be faulty. Keep us posted.
  # 8  
Old 06-04-16, 23:54
Shaolinfist Shaolinfist is offline
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Yes I definitely will keep you updated thanks.
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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights
  # 9  
Old 16-04-16, 18:16
Shaolinfist Shaolinfist is offline
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OK so mystery solved, I think. I fitted my new chain and sprockets today and upon inspection of the old chain it seems that I tightened one of the rivets on the master link too tight as it was very stiff. I am assuming that this is what caused the premature wear on the Renthal sprockets. I checked and double checked the master link on the new chain after riveting and it seems as flexible as the others so hopefully I will not get the same problem again. If I do it will be endless chains for me from now on even if it does mean I have to remove the swingarm to fit them! It was my first time riveting a chain however and I feel confident that I have done it properly this time so I doubt I will have to resort to that.
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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights
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