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I was chatting to clay about these earlier, as both of us are engineers, I dont understand why these would keep a chain on?

Less lateral (side ways) play, with a clutched rear mech I would be surprised for the chain to come off on anything other than a proper dh track

So its more about the mech than the ring, thought as much

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"The idea behind the Narrow/Wide chainring is the same as SRAM's X-Sync: alternating teeth are made extra-wide to more fully fill the gap between the side plates as the chain passes through. Meanwhile, all of the teeth are also a bit taller than usual to further prevent derailment." - taken from a race face review

Interestingly I was reading some stuff recently where people seem to think through their own testing that the chain-ring was the most important element in not having the chain come off rather than the clutch... ie they upgraded to clutches when they came out - still lost their chain - but less.... but then added the ring - no dropped chain. I suspect its the combo of the 2 which covers all the different chain derailment scenarios.

The chain does move about quite a bit even with a clutch https://www.youtube.com/watch?v=7CmkBJiOQ8c

Been running narrow wide + clutch for a year now and only lost the chain once when the drivetrain got packed with mud

Any CRC vouchers kicking about that John can use after he trashed his forks on tuesday ?

Didn't get a voucher code.

Cheers, i can pass it on to John to help him out.

The Hans Dampf deal is back, not bad for £52 + postage: http://www.bike-discount.de/en/buy/schw ... /wg_id-241

Merlin got sale on tyres also have hans damp to.

http://bikes.merlincycles.com/search?vi ... 973909_10#

£44.95 for 1 tyre though laser, the bike-discount one is a pair for £52.

I got Hans Dampf and Nobby Nic from bike-discount.de , great price and fast delivery..

There is no one cheaper for these tyres..!!

Bicycle Repair Stand back at Aldi 29.06.2014 at ALDI: https://aldi.in/4djr

Someone was looking for one sone weeks back.