New front sprocket every 10K?

[Beehive Bedlam]

Dellboy suggests to replace the front sprocket every 10K as it apparently wears three times faster than the rear.

The first five minutes makes a lot of sense but when he pulls the old sprocket off and compares it with the new there doesn't appear to be a great deal of wear so I am not convinced this is anything more than OCD.

Link.

[Ariel Badger]

WTF do you expect from HD? Bunch of shysters.
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Bikers make great organ donors, get 115 on your licence today.

[davebike]

I have on my own bike swapped out the front sprocket at about half life as it starts to wear it SLIGHTLY extends chain life but I not sure it worth the effort

It makes a lot of vibration for 500 to 1k miles after the change which is why I don't think I bother again
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Dave
NC750Xdct + others at work !
davebike1@gmail.com

[Rogerborg]

<armchair experts>But you should always replace chain and sprockets as as a set or they ASSPLODE! </armchair experts>

Love the Teflonian bollocks about the chain lengthening because the outer faces of the rollers are wearing thinner. Because of course fractions of a millimetre of wear at the 4 points where they intersect with the leading/trailing teeth on the sprockets adds all that slack in the middle.

He does however make an interesting point that a worn sprocket is likely to wear a chain by tugging on it (and wearing the pins and bushings). Given the relatively low cost of the front sprocket it might actually be worth replacing it as soon as it starts to hook.

<gets out of armchair and goes to garage>
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[G]

'Not sure if troll', considering the OP.

Stopped video at "it's not hard, is it?" - often front sprockets are made from a tougher material (steel vs a lighter alloy), meaning that it can be the rear sprocket wearing out first.

[monkeybiker]

[wr6133]

Isn't this the same youtube guy that did a video where he said his wife has massive chicken strips because her bike can never lean that far due to exhaust in the way and then proceeded to scotchbrite them off saying it wasn't to be a fake poser but for safety in case she ever needed to lean that far? (despite already stating her exhaust meant she could never lean that far).

If so I'd take his advice with pinch of salt.

[Rogerborg]

[MCN]

The worn sprocket will wear the chain because the wear in the sprocket effectively changes the pitch. The pitch being the distance between the pin of one link assembly and the pin/s of the adjacent links.

The damage will not be 'impact' as any chain slack will be 'taken up' on acceleration (and deceleration).

Any 'additional wear will be from the extra load on the pins and bushes due to the extended pitch 'stretching' the pitch of the chain.

The wearing three times as fast may be correct but again it it possible the front and rear sprocket materials hardness will differ to compensate if 'matched'.

Paint diagram req.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[MCN]

This is what can happen when a chain snaps.

Delboy said to not even google it.

Well fuck him I did.

https://www.youtube.com/watch?v=rEaj4Lc3Ro0
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[kerr]

[gbrand42]

[Pete.]

Reducing diameter of the rollers doesn't affect the pitch, which is the distance the pin centres are apart. If the distance the pins are apart doesn't change then the chain is not able to be any longer in length because adding up all those pitches is what gives you your overall length.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Rogerborg]

[Kickstart]

Hi

Hardness of the sprockets will make a big difference. Some last no time at all (some are alloy so wouldn't expect them to), but front ones are normally far harder.

But on some older bikes the sprockets lasted far longer than chains.

All the best

Katy
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Snod Blatter]

I replace the front sprocket once it becomes noisy, and they seem to become noisy because they "pick" at the chain as it tries to leave the teeth on the underside. The result so far has been negligible chain wear in 28K miles on the CB250. For posterity I have also been keeping a record of how each brand of sprocket lasted, complete with awful pictures (thanks Nokia and your EDoF cameras!). The 530 JT on the front of the TRX is starting to hook too at only 8K, so every 10K could be on the money..

Just my experiences
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1994 CB250, 1984 CBX250RS-E, 1989 K100RS, 1995 TRX850, 2016 Z250SL

[Pete.]