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PostPosted: Mon Sep 18, 2017 11:27 am 
Dirt Disciple

Joined: Mon Mar 06, 2017 4:44 pm
Posts: 27
Ive got a set of Middleburn RS1 Cranks on my MTB that I just bought. However they just keep on coming loose.

Do I require anything special when using thsese cranks?

I think the taper has gone on the cranks as it look worn but the seller says that it might be due to the type of spindle?

Hope you guys can help?


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PostPosted: Mon Sep 18, 2017 11:31 am 
Old School Grand Master

Joined: Wed Feb 26, 2014 8:20 pm
Posts: 5494
seanfish wrote:
Ive got a set of Middleburn RS1 Cranks on my MTB that I just bought. However they just keep on coming loose.

Do I require anything special when using thsese cranks?

I think the taper has gone on the cranks as it look worn but the seller says that it might be due to the type of spindle?

Hope you guys can help?


Get some pics up but sounds like they are most likely worn. I'd be after a full refund including postage costs to send them back.


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PostPosted: Mon Sep 18, 2017 11:48 am 
Dirt Disciple

Joined: Mon Mar 06, 2017 4:44 pm
Posts: 27
Minifreak wrote:
seanfish wrote:
Ive got a set of Middleburn RS1 Cranks on my MTB that I just bought. However they just keep on coming loose.

Do I require anything special when using thsese cranks?

I think the taper has gone on the cranks as it look worn but the seller says that it might be due to the type of spindle?

Hope you guys can help?


Get some pics up but sounds like they are most likely worn. I'd be after a full refund including postage costs to send them back.



So you dont think chnge of BB is gonna help, i am reluctant to spend more money and find out theyre still fu*ked..


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PostPosted: Mon Sep 18, 2017 11:55 am 
Old School Grand Master

Joined: Wed Feb 26, 2014 8:20 pm
Posts: 5494
seanfish wrote:
Minifreak wrote:
seanfish wrote:
Ive got a set of Middleburn RS1 Cranks on my MTB that I just bought. However they just keep on coming loose.

Do I require anything special when using thsese cranks?

I think the taper has gone on the cranks as it look worn but the seller says that it might be due to the type of spindle?

Hope you guys can help?


Get some pics up but sounds like they are most likely worn. I'd be after a full refund including postage costs to send them back.



So you dont think chnge of BB is gonna help, i am reluctant to spend more money and find out theyre still fu*ked..


Very unlikely a steel BB axel is the culprit, much more likely the alloy crank square is ****. It'll never work if it is and over tightening will just make it worse. Get a refund buddy and find some more but check before you buy.


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 Post subject: Re:
PostPosted: Tue Sep 19, 2017 11:44 am 
BoTM Winner
BoTM Winner

Joined: Thu Jan 19, 2006 1:23 pm
Posts: 2873
Location: NW England
What BB are you using? There are 2 types of square taper and using the wrong one can lead to the crank arm not being properly secured. If you're using shimano un71 etc though then it's almost definitely the cranks that are worn.


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 Post subject: Re:
PostPosted: Sun Sep 24, 2017 6:21 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
User avatar

Joined: Thu Aug 24, 2006 8:32 pm
Posts: 1542
Location: Southport, UK Member No:411
You will laugh, but it can usually be sorted by making 4 little shims from coke cans. These sit in between each face of the BB and the taper on the crank. Once secured they rarely come lose again.
I've run a set of M900 cranks like that since about 2003!


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 Post subject: Re:
PostPosted: Sun Sep 24, 2017 9:02 pm 
Retro Guru

Joined: Wed Aug 24, 2011 9:31 pm
Posts: 850
Location: somewhere in time
Check the crank bolts.
Are you using bolts that cover the complete inner of the crankarm holes? If not, there could be the problem. I used titanium bolts on m900 cranks and the bolts didn't cover all of the crankarm hole. The crankarms came loose again and again. I replaced the bolts with steel Shimano bolts that covered the complete crankarm hole, and they never came loose again.


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 Post subject: Re: Re:
PostPosted: Sun Sep 24, 2017 10:18 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
User avatar

Joined: Fri Jul 23, 2010 4:13 pm
Posts: 4434
Location: Royal Forest of Dean (Still looking for the Bear !)
Remko wrote:
Check the crank bolts.
Are you using bolts that cover the complete inner of the crankarm holes? If not, there could be the problem. I used titanium bolts on m900 cranks and the bolts didn't cover all of the crankarm hole. The crankarms came loose again and again. I replaced the bolts with steel Shimano bolts that covered the complete crankarm hole, and they never came loose again.



Mine kept coming loose and it was the crab bolts ....

I didn't lose any friend on the sportive I was riding but I came very close.


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 Post subject: Re:
PostPosted: Sun Sep 24, 2017 10:41 pm 
gold | rider | rBoTM
gold | rider | rBoTM

Joined: Sat Jan 05, 2013 5:06 pm
Posts: 12485
Location: Worthing, West Sussex
Yes you did Nick! :roll:

Lesson learnt! :wink:

Mike


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