Author Topic: Nail in coffin for shaft drive?  (Read 723 times)

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Offline richtea

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Nail in coffin for shaft drive?
« on: August 28, 2020, 04:17:51 pm »
https://www.motorcyclenews.com/news/new-tech/bmw-m-endurance-chain/

The cynic in me says it may be maintenance-free, but will last the lifetime of a motorcycle?
« Last Edit: August 28, 2020, 07:38:28 pm by richtea »

Offline Phmode

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Re: Nail in coffin for shaft drive?
« Reply #1 on: August 28, 2020, 06:47:11 pm »
Not sure how it would work on my K13  ::)

And no mention of what it does to the sprockets...

Offline black-k1

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Re: Nail in coffin for shaft drive?
« Reply #2 on: August 28, 2020, 07:45:37 pm »
What happens to the sprockets is the key question.  That said,  I'd pay the extra for a chain that didn't need oiling and adjusting even if it needed a new set of sprockets every 25,000 miles
Correct rear brake use is scientifically proven to shorten stopping distances in EVERY road situation.

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Offline raesewell

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Re: Nail in coffin for shaft drive?
« Reply #3 on: August 28, 2020, 08:00:13 pm »
Not sure how it would work on my K13  ::)

And no mention of what it does to the sprockets...

Diamond coated sprockets?  :-[

Offline Phmode

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Re: Nail in coffin for shaft drive?
« Reply #4 on: August 28, 2020, 09:05:45 pm »
I 'think' that the diamond coatings are on the inside of the rollers and the outside of the pins making almost zero friction when the rollers 'roll' around the pins.

The outer of the rollers must just be hardened steel otherwise, on a high output engine, the sprockets wouldn't last long enough to get out of 2nd gear. Or even into it  ::)

Offline richtea

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Re: Nail in coffin for shaft drive?
« Reply #5 on: August 28, 2020, 09:48:10 pm »
Sprockets - consumable, like brake pads. Or shaft drive oil.

Offline Matt

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Re: Nail in coffin for shaft drive?
« Reply #6 on: August 28, 2020, 10:35:54 pm »
Ah I read this earlier and did wonder about the sprocket! Until we have hub centre motors there'll always be consumable bits somewhere.

I do look forward to seeing them in the garage and hearing the blingo lingo they'll have been told to parrot though.
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Offline revd

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Re: Nail in coffin for shaft drive?
« Reply #7 on: August 29, 2020, 10:05:24 am »
Typical, I buy a shaft drive bike to get away from chain hassles (Tuturo sorted that nicely TBH) and they come out with the solution....

Sprockets are still a maintenance item, can affect gearing and so on.
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Offline Phmode

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Re: Nail in coffin for shaft drive?
« Reply #8 on: August 29, 2020, 11:08:37 am »
The last maintenance free drive system BM brought out was the rubber band. Chewed up the rear sprocket on a mate's bike and all but killed him... ::)

Offline Swindon Andy

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Re: Nail in coffin for shaft drive?
« Reply #9 on: August 29, 2020, 11:31:07 am »
Would the sprockets last longer with chains that wear more slowly? Asking for a friend.

Offline Phmode

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Re: Nail in coffin for shaft drive?
« Reply #10 on: August 30, 2020, 09:37:30 am »
I have no idea how they stop the chain stretching. Maybe David can give his 2d's worth as he now has a chain on a big power motor.

When the chain stretches, the pitch of the rollers changes and that is what wears the sprockets the most apart from road crap.

Offline black-k1

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Re: Nail in coffin for shaft drive?
« Reply #11 on: August 30, 2020, 10:18:11 am »
I'm not sure I have any more insight than anyone else.  What I can say is that even with 200+bhp, torque that dwarfs a K1300S in any gear and at any revs, on a bike weighing almost the same as the K1300S,  after 15,000 miles, I've still not had to adjust the chain. That doesn't mean it's not been adjusted,  only that adjustment requirements have, so far, managed to align with servicing and tyre replacement. 

I expect that the BMW chain will stretch and will need replacing but rather than it taking 5000 to 20000 miles as with a "normal" chain,  depending on how it's looked after,  it'll be 40,000 to 60,000 miles and adjustment intervals for stretch will align with service intervals so will be done by your friendly BMW dealer.
Correct rear brake use is scientifically proven to shorten stopping distances in EVERY road situation.

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Offline Phmode

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Re: Nail in coffin for shaft drive?
« Reply #12 on: August 30, 2020, 02:52:20 pm »
That was the insight I was after David. My last chain driven big bike was my Honda CBR1000F-H with a useful 130PS on tap back in 1987 and that needed its chain adjusting after a ride to the Med on the motorway, again whilst thrapping it in the mountains and once more after I got home... ???

Chains have moved on since then apparently.

Offline CrazyDave

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Re: Nail in coffin for shaft drive?
« Reply #13 on: September 03, 2020, 09:37:18 am »

Interesting...

I'm very happy with the shaft drive I have on the K.

I may get this though for my ZZR1400.

If I do, I'll do a video. If there's a bike to give it a test on that has to be a candidate.

Dave

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Offline raesewell

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Re: Nail in coffin for shaft drive?
« Reply #14 on: September 03, 2020, 10:29:46 am »
I'm not sure that BMW will put these on general sale I feel that they will only fit them to their own bikes.