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NuVinci hub skipping

Old 12-16-14, 01:57 PM
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adlai
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NuVinci hub skipping

Hi guys,

So I installed an N360 onto my bike.

The chain skips. It feels like a very badly adjusted derailleur.

I have tried moving to a smaller chain. Still skips. I suspect the issue might be the lack of chain tension. But I can't figure out a way to increase chain tension. Most tensioners have a bolt and...it's kind of blocked with the nuvinci.

Other than that, any ideas?
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Old 12-16-14, 02:17 PM
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Are you using the right chain? If the NuVinci cog requires a 1/8" (track or single speed) chain and you are using a 3/32" derailleur chain, the chain will never seat properly on the cog.
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Old 12-16-14, 02:34 PM
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Originally Posted by adlai View Post
Hi guys,

So I installed an N360 onto my bike.

The chain skips. It feels like a very badly adjusted derailleur.

I have tried moving to a smaller chain. Still skips. I suspect the issue might be the lack of chain tension. But I can't figure out a way to increase chain tension. Most tensioners have a bolt and...it's kind of blocked with the nuvinci.

Other than that, any ideas?
I am having a hard time figuring out why you can't increase chain tension. Most bikes have no bolt or mechanism to tension the chain - you just need to loosen the axle nuts and slide the wheel back. However, my experience has been that, on single cog/chainring drivetrains, you need very little 'tension' for everything to work properly, so this might not be the problem at all.
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Old 12-16-14, 02:58 PM
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Those use a screw on Freewheel Right? chain and freewheel all new ?. SS F/W are sold in 3/32" & 1/8".. what did you Buy?

take it to someone that can See It.

Last edited by fietsbob; 12-16-14 at 03:20 PM.
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Old 12-16-14, 03:13 PM
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First double check that you do have a 1/2 x 1/8" chain (for single speed or coaster brake). As pointed out above a 3/32" derailleur chain CANNOT work.

NEXT, If you have vertical dropouts, there's no way to tension the chain by moving the wheel back. You have to use an idler arm (looks sort of like a derailleur) chain tensioner. OTOH if you have horizontal dropouts, slide the wheel back and center it in the frame so that you pull out all but a bit of slack --- Do not actually tension the chain. The proper "tension" or slack is such that there's about 1/8" free vertical play in the center of the chain.
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Old 12-17-14, 12:23 PM
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I fixed it. Chain is actually a little too tight. But I removed a link.

Skipping is now gone.

Not the optimal solution.

This is a mod. Vertical dropout bike. Not horizontal.
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Old 12-17-14, 12:36 PM
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Originally Posted by adlai View Post
I fixed it. Chain is actually a little too tight. But I removed a link.

Skipping is now gone.

Not the optimal solution.

This is a mod. Vertical dropout bike. Not horizontal.
Vertical dropouts are far from ideal for any non-derailleur application. Sometimes they work out where you can get reasonable chain slack (tension) based on the serendipity of the chainstay length, and sprocket combination, but it's not likely that it'll be spot on.

The right solution for you is a spring idler arm on the lower loop to set the chain tension (slack) exactly how it should be (1/8" free play at the center of either loop)
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Old 12-25-14, 04:37 PM
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A little late, but to counter a bunch of misconceptions:

The N360 uses standard 9-spline cogs, not a screw-on freewheel.

The Nuvinci is designed for 3/32" cog and chain. The manual actually says "Due to tight clearances at the N360 hub interface, the NuVinci N360 is incompatible with 1/8 inch (3.18mm) single-speed chains and sprockets. Use 3/32 inch (2.3mm) chains and sprockets only."
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