custom chainring for reduced chain drop?

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bluechair84
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custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 12:40 pm

I've been thinking about this xx1 gear. They reckon that their single ring is able to keep the chain on without the need for a guide. Part of this reason is the teeth are alternatly large to coincide with the chain links. But I wondered if it was also because of the lack of shifting ramps.
Now, I sometimes suffer from a dropped chain on my 2x9 trail bike, it's not too bad. I don't use the granny all that much - I'd rather put a larger spread cassette on the back for spinning. Is anyone running a custom single ring that isn't as highly machined as the rings on a triple and does it hold onto the chain better? When this transmission if out of life, I'm thinking of going 1x9/10 without a guide.

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Re: custom chainring for reduced chain drop?

Postby Chunkers1980 » Fri Nov 16, 2012 12:44 pm

Your granny most prob has larger teeth that are not machined in anyway as that only goes up.

Yes, of course, you want a non ramped ring on a 1x setup for sure, it'll hold the chain much better.

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bluechair84
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Re: custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 12:53 pm

Cool, that's what I hoped. TBH, I'm running a BETD ring on the DH bike, but with a guide. It holds fine whilst riding but pretty often, if I lay the bike down the chain moves and gets snagged in the guide meaning I have to dismantle the thing to get the flippin' chain back. The tollerances are set up as tight as they can be... not sure what the frig it's doing. I'm hoping Clutch makes it to 9 speed and I'll try clutch and no guide on the DH bike.

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nicklouse
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Re: custom chainring for reduced chain drop?

Postby nicklouse » Fri Nov 16, 2012 12:55 pm

not really it will still bounce off.

maybe some of these new style rear mechs that say they controll the chain better may help but i dont see that they will much.
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nicklouse
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Re: custom chainring for reduced chain drop?

Postby nicklouse » Fri Nov 16, 2012 12:56 pm

bluechair84 wrote:Cool, that's what I hoped. TBH, I'm running a BETD ring on the DH bike, but with a guide. It holds fine whilst riding but pretty often, if I lay the bike down the chain moves and gets snagged in the guide meaning I have to dismantle the thing to get the flippin' chain back. The tollerances are set up as tight as they can be... not sure what the frig it's doing. I'm hoping Clutch makes it to 9 speed and I'll try clutch and no guide on the DH bike.

sounds like something is not set up right there.
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bennett_346
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Re: custom chainring for reduced chain drop?

Postby bennett_346 » Fri Nov 16, 2012 13:11 pm

bluechair84 wrote:I'm hoping Clutch makes it to 9 speed and I'll try clutch and no guide on the DH bike.

Can't see that happening as clutch mechs are one of the main pull factors the manufacturers use to get people onto 10 speed.

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ride_whenever
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Re: custom chainring for reduced chain drop?

Postby ride_whenever » Fri Nov 16, 2012 13:14 pm

Any proper single speed/track chainring generally won't drop the chain.

On my road bike I run a 1*10 setup and never lose the chain since I switched to a surly stainless steel ring with no shifting ramps or gates.

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bluechair84
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Re: custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 13:56 pm

ride_whenever wrote:Any proper single speed/track chainring generally won't drop the chain.

On my road bike I run a 1*10 setup and never lose the chain since I switched to a surly stainless steel ring with no shifting ramps or gates.


Did it make as much difference as clutch (if you have that on your mech)?

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bluechair84
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Re: custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 14:02 pm

nicklouse wrote:
bluechair84 wrote:Cool, that's what I hoped. TBH, I'm running a BETD ring on the DH bike, but with a guide. It holds fine whilst riding but pretty often, if I lay the bike down the chain moves and gets snagged in the guide meaning I have to dismantle the thing to get the flippin' chain back. The tollerances are set up as tight as they can be... not sure what the frig it's doing. I'm hoping Clutch makes it to 9 speed and I'll try clutch and no guide on the DH bike.

sounds like something is not set up right there.


Without wanting to start a workshop thread; the chain only comes off when I'm like... eating a mars bar or drinking tea. Never whilst riding. And it is impossible to put back on again without taking off part of the guide and re-threading the chain - so there's no large gaps between the pully and guide where it can shift. I can't for the life of me work out how it's doing it... As it's not happening whilst riding though, I'm fine with it. I'll start a workshop thread if I inexplicably loose my rag with it though.

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Re: custom chainring for reduced chain drop?

Postby Northwind » Fri Nov 16, 2012 14:45 pm

The clutch mechs make a big difference- I'm running just a top guide and the clutch mech on the Ragley, wouldn't have got away with that with a standard mech. It'll still drop the chain occasionally when doing non-ridey things... Mostly when taking the bike out of the car. Which is irritating sometimes but not worth the weight and hassle and drag of a full chainguide.
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lawman
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Re: custom chainring for reduced chain drop?

Postby lawman » Fri Nov 16, 2012 15:22 pm

I'm running a xtr clutch mech and an LG1+ guide and a dedicated single speed E-13 guide ring on the HD, and it is stupidly, eerily quiet now and whilst I never lost a chain with a normal mech, there is no way I can see it happening now. I run the same chainring on the 456c, but with a top guide only and a normal mech. I have lost the chain once. It will be getting a clutch mech soon as it sounds like a bag of bolts, so I will see if it works without the guide, as tbh I reckon the LG1 is over kill for the HD now.

If shimano make a proper 1x10/11 groupset with similar capabilities to XX1, I will definitely be buying, the extra range of the cassette of the chain retention really appeals to me, but I much prefer the feel of shimano kit

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bluechair84
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Re: custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 18:09 pm

With so many people happy with their 1x9/10 and custom rings improving on chain retention, hopefully someone will make chainrings with alternating tooth sizes too.

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Re: custom chainring for reduced chain drop?

Postby ricardo_smooth » Fri Nov 16, 2012 18:16 pm

the clutch rear makes a world of difference on the Nomad.

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bluechair84
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Re: custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 18:30 pm

ricardo_smooth wrote:the clutch rear makes a world of difference on the Nomad.

Yeah, everyone I come across that uses one thinks so. I'll move on up to 10speed and clutch when the current lot is smooth as a baby's ars*. Will I be seeing the Nomadc on Sunday?


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bluechair84
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Re: custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 21:17 pm

wako29 wrote:little known fact. The Shimano 10sp pull ratio is REALLY close to the SRAM 9sp pull ratio. Want 9sp with Shadow Plus? Get a 9sp SRAM shifter and a 10sp Shimano rear D. Still, you have to admire his ingenuity

Aweosme bit of home engineering... but this is even more interesting :)

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YeehaaMcgee
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Re: custom chainring for reduced chain drop?

Postby YeehaaMcgee » Fri Nov 16, 2012 21:42 pm

bluechair84 wrote:Now, I sometimes suffer from a dropped chain on my 2x9 trail bike

Get a bashguard and a stinger, fit them (properly), and it will never happen again.

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Re: custom chainring for reduced chain drop?

Postby Northwind » Fri Nov 16, 2012 22:05 pm

bluechair84 wrote:
wako29 wrote:little known fact. The Shimano 10sp pull ratio is REALLY close to the SRAM 9sp pull ratio. Want 9sp with Shadow Plus? Get a 9sp SRAM shifter and a 10sp Shimano rear D. Still, you have to admire his ingenuity

Aweosme bit of home engineering... but this is even more interesting :)


"Really close" =/ the same. Some folks have tried it and reckon it works well enough, but the reality is you'll get a handful of gears to work right, and all the rest work as well as any other misadjusted drivetrain.

If you want to use just a few gears though, it does the job, so could be a good option for downhill bikes etc.
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bluechair84
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Re: custom chainring for reduced chain drop?

Postby bluechair84 » Fri Nov 16, 2012 22:14 pm

Crud. I'd never heard of the Shim/sram 10/9 mix before. I'll probably be shuffled along the 1x10 road as things wear out and go for a custom ring - at least on the trail bike. I'll have a chainguide on the DH bike for a long time yet.

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lawman
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Re: custom chainring for reduced chain drop?

Postby lawman » Fri Nov 16, 2012 22:23 pm

For DH bikes there is no reason, no matter how good chain retention a special chainring can offer. It's on "enduro", AM or trail bikes that the benefits of increased retention without the drag of a full chainguide are most noticeable.


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