m8000 delay downshifting
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dave0w



Joined: 25 Jun 2013
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PostPosted: Thu Jan 05, 2017 9:45 pm    Post subject: m8000 delay downshifting Reply with quote

the day i got my new bike as was impressed with the speed of up and down shifting, and how responsive it was.
now its been about 2 months and the up shift still feels super good, but down shifting as a delay of upto 5 seconds.

any advice on what to do or looks for.

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Doomanic



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PostPosted: Thu Jan 05, 2017 10:00 pm    Post subject: Reply with quote

When you say "downshifting" do you mean to a lower gear or down the cassette?
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ryansam



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PostPosted: Thu Jan 05, 2017 11:15 pm    Post subject: Re: m8000 delay downshifting Reply with quote

dave0w wrote:
the day i got my new bike as was impressed with the speed of up and down shifting, and how responsive it was.
now its been about 2 months and the up shift still feels super good, but down shifting as a delay of upto 5 seconds.

any advice on what to do or looks for.


A few turns on the barrel adjuster should do the trick.

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dave0w



Joined: 25 Jun 2013
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PostPosted: Fri Jan 06, 2017 1:17 am    Post subject: Reply with quote

Doomanic wrote:
When you say "downshifting" do you mean to a lower gear or down the cassette?

i mean down the cassette


ryansam wrote:
A few turns on the barrel adjuster should do the trick.

i will give this a go

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Doomanic



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PostPosted: Fri Jan 06, 2017 11:09 am    Post subject: Reply with quote

Might just need a clean and re-lube.
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dave0w



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PostPosted: Fri Jan 06, 2017 12:38 pm    Post subject: Reply with quote

Doomanic wrote:
Might just need a clean and re-lube.


the bike as sealed cables top to bottom so no grit/gunk can get it, cube say never to lube the cables. as for the drive train i wash and lube after ever use.

bike is only 2months old so the sealed cables should still be in good condition.

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KTM540



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PostPosted: Sat Jan 07, 2017 10:27 am    Post subject: Reply with quote

New bike, so after a couple of months use things like cable tensions will need a little tweek as they stretch and free up and so on .. as said, the barrel adjusters are for fine tuning the shft, and will prob be enough for what you need

I would also recommend just going around a couple month old bike with your allen keys, just make sure nothing has come loose (not tighten anymore, just check if loose Wink )

Happy MTBing Smile

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Nik Gnashers



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PostPosted: Sat Jan 07, 2017 10:12 pm    Post subject: Reply with quote

After a few weeks of use, I would expect a new gear setup to do the opposite, ie shift down when it's not supposed to do, because of the cable stretch, and struggle to shift UP.
if it's struggling to change down, I would suggest the idea that you might have maybe washed the lubrication out of the actual thumbshifter and it's sticking a bit maybe ?
You could try some decent chain lube into the thumbshifter mechanism, which might help.
The only other things that could affect things, would be damage to the cable it it's been crushed by being trapped between the frame and any rocks you may have ridden over, that would cause it to stick a bit and be slower changing down.
The last option would be the rear mech or hanger has got bashed and has been knocked 'up' the cassette a bit causing it to not shift down correctly.

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KTM540



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PostPosted: Sun Jan 08, 2017 11:34 am    Post subject: Reply with quote

I've experienced both with new bikes, up and down shifting problems .. both were put right by in or out on the shifter barrel adjuster, or a tweak of the Bscrew etc, I was more on about a final setting up of stuff whatever it may be when all has bedded in and settled down from the factory, not that its deffo a stretched cable, it might have been slightly too tight from new, and only now starting to show .. difficult to say without seeing the bike


Most bikes are walloped together on a production line (no matter how much it cost you Mad ) just have a good look around it Wink

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dave0w



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PostPosted: Tue Jan 10, 2017 8:19 pm    Post subject: Reply with quote

i was told it could be down to the drop in temps. it was 18c when i got the bike now we are seeing 0-2c on a morning.

what ever the problem was adjusting the barrel adjuster looks at to fixed the problem, although i did give the bike a full lube on sunday so that may also have fixed the problem

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Nik Gnashers



Joined: 30 Dec 2014
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PostPosted: Sun Jan 15, 2017 10:51 am    Post subject: Reply with quote

dave0w wrote:
i was told it could be down to the drop in temps. it was 18c when i got the bike now we are seeing 0-2c on a morning.

what ever the problem was adjusting the barrel adjuster looks at to fixed the problem, although i did give the bike a full lube on sunday so that may also have fixed the problem


Mad Glad to hear it's now working correctly.

The temperature thing could be true, as I noticed a slight slowness to my downshifts lately when it was hovering around 0 degrees, but I have opened my shifters and lobbed a wad of grease in there, which would obviously get a lot more viscous (thick, sticky consistency between solid and liquid) in lower temps.
I did this because I use the pressure washers at trail centres a lot, and realise that thin lube could easily be washed out of the shifter, hence some thick sticky stuff was lobbed in lol ...

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