- 1×9 keeps shedding its chain – advice needed
My 13y.o. son's DMR Sidekick keeps losing its chain on any bumpy terrain – which is a tad frustrating for the young'un when he's at the local mntn-boarding/biking place.
We've gone 1×9 with it because we live in a fairly hilly area (he inherited XT derailleur and XTR shifter off me) – but recently the chain has been coming off quite regularly. Is this chain stretch (could remove a couple of links?) or does he need a chain device to add tension at the front end? (eThirteen spotted by him at 70 notes… :cry:)
Any advice appreciated…he's available for car washing duties !Posted 8 years agojamesMember
Superstar do a 'full'(ie upper guide plus lower roller) chain device for £35, okay so its not DH race bike weight but its pretty cheap compared to pretty much everything else
The bike will need ISCG/ISCG03, ISCG05 or a Bottom Bracket mounting though
So if the frame doesn't have 3 bolt mountings, or an external type bottom bracket bearing cups, then you'll have to get a special chain device type bottom bracket, or if the frame has a 68mm bottom bracket shell you can use a 73mm bottom bracket, stick the chain device on one side and add an external bottom bracket 2.5mm spacer on the other
There are loads of other ways, but if the bike is for jumping etc then it maybe that a full chain device maybe best
Other solutions include:
Front mech with low limit screw wound out and clamped so it sits low to chainring
Bash guard + inner bash ring (~£16* + ~£28**)
Bash guard + N gear jump stop (~£16* + ~£10)
Pauls components Chain Keeper (I think its called that) (~£50?)
Rohloff Chain Guide (~£50)
MRP 1x/e13 XCX top guides (~£40)
there must be more
*eg FSA polycarbonate on CRC
**eg blackspire on CRC
You have got the correct length chain haven't you? round the biggest 2 rings (only got the one at the front) plus one pair of links overlapPosted 8 years agoskiMember
Use one of these on my setup, works fine, easy to setup too.Posted 8 years ago
Thanks TJ, the chainring is unramped.
The bike has been fine for the last 5/6 months, ridden regularly with no 'chain' issues so may be a bit of stretch or his riding is becoming a bit more enthusiatic / aggressive?
How tricky is a typical chain device to fit? One for the LBS or easy-peasy?Posted 8 years agoflangeSubscriber
I've just bought the e13 xc chain device thing and its a load of sh1t – how they get away with charging £35 for something that has so little adjustment (and consequently doesn't work) is beyond me. Unless you're running road bike tolerences on your front ring/bb, I wouldn't bother with the XC specific ones (that includes the MRP one as well).
Just wind the adjuster screws out on an old front mechPosted 8 years agotinsyMember
Proper chain devices can be agro to setup but great when sorted, something like an MRP or pauls chainkeepr or the n gear jump stop and bash are fit in the dark easy…
When I run 1×9 at first it wasnt too much trouble but they do get lots worse as the chain wears its not the strech as much as how much easier a worn one goes side to side,,,,
Just make sure you got it as short as possible, fit a simple device like the Pauls chainkeepes and it should be fine.Posted 8 years agofuton river crossingMember
I finally gave in and got an MRP 1x, fed up of chain falling off during the fun fast parts of the ride. One warning though, the bolt is made of alloy, I managed to ruin mine very easily, had to drill it out and put a proper steel on in there. Works well though.Posted 7 years agocrogthomasMember
One old Alivio derailleur, a bolt, some penny washers and assorted other aluminium spacers (washers would do). Remove cage, add spacers, flip upside down, et voila, one chain retention device.
Take a hacksaw and file to it to remove redundant lumps and it even looks quite slick (from a distance, with mud in your eyes).
Posted 7 years ago
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