Member Jonathan Kay Posted May 31, 2013 Member Share Posted May 31, 2013 The pedal thread in the RH crank on my bike is stripped. Deore XT, alloy, Dawes Galaxy, about a year old. I think I've got too main options: remove and replace the crank, or fit a threaded insert. As it's the RHS I think I'll try the threaded insert. I've never done this or tapped a thread before. What sort of insert would you use and any other advice on how to do this? Or would you replace the crank? I found this advice on the Park site. Thanks Jonathan Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 31, 2013 Leadership Team Share Posted May 31, 2013 Replace the arm/spider, it'll likely be cheaper! They usually strip because they're not located fully. Stu. Link to comment Share on other sites More sharing options...
Phil B Posted May 31, 2013 Share Posted May 31, 2013 Jonathan, Why not have a chat to your local bike shop, chances are if they have a decent workshop they will have the correct tools and can fit the thread insert at a reasonable cost. Phil B Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted May 31, 2013 Share Posted May 31, 2013 Not sure about the XT, but some of the Shimano cranks (like some of the SLX cranks) have threaded inserts for this reason. Had some fun getting pedals out of those in the past... This was one of them: http://gp1.pinkbike.org/p4pb8776220/p4pb8776220.jpg Had to file flats in to it to get in a vice. Anyway, I've never had a crank helicoiled or modified to accept a threaded insert. I'd err on the side of caution, they are made of cheese after all. Also, unless you're lucky with the threadlock, the pedal will likely pull the insert out with it each time, like mine did. If you've never done it before, get a shop to do it while you watch. Personally, I think it's time for an upgrade 😬 What BB are you running? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 31, 2013 Author Member Share Posted May 31, 2013 Thanks everybody. Much appreciated. What's the minimum dismantling to get the spider off? Any guides available? Jonathan Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 31, 2013 Author Member Share Posted May 31, 2013 Bottom bracket is Shimano SM BB51 Mountain Crank is Shimano 170 FC M591, around £60. Found an exploded diagram. Am I going to disturb the BB and need some proprietary tool to adjust it if I remove the LH crank from the axle and pull? Jonathan Edited by - Jonathan Kay on 31 May 2013 15:00:06 Link to comment Share on other sites More sharing options...
Phil B Posted May 31, 2013 Share Posted May 31, 2013 Taking the LH crank off will not disturb bearings. You do need a spacial splined tool to remove the end cap/screw (item 1). Slacken the allen bolts first then unscrew. You don't need to remove the 2 small allen bolts completely, they just need to be slackened enough to allow the crank to be pulled off. The RH crank can then be pulled through with the chain rings still attached. The bearing cups will remain screwed into the BB housing. Be careful to note the various spacers and O rings as these will need to be re-installed in the correct orientation. Phil Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted May 31, 2013 Share Posted May 31, 2013 The LH crank fixing is just to adjust how far on the axle the LH crank sits. So if you don't have the tool (although I'd recommend you spend a few quid on Amazon as it will get you the BB tool and crank fixing tool, like this), you should be able to extract it with care. Then just loosen the two screws on the crank and remove the LH arm. You may need to persuade the RH crank out with a mallet You shouldn't disturb the BB. If you replace the crank, it will likely come with a BB. So you might as well replace the whole lot in one go, it's pretty easy with the above tool. Helps to have it to install the LH crank as well. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 31, 2013 Author Member Share Posted May 31, 2013 Thanks. Tool ordered. Jonathan Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 1, 2013 Author Member Share Posted June 1, 2013 Response from the seller:I am sorry to hear of the problem with your crankset. I am afraid that neither Dawes nor Shimano will cover a crankset under warranty where the pedal threads have been stripped in the crank. It is a relatively common problem which is usually caused by the bike been ridden with the pedal loose in the crank or improper installation of the pedals. The crank can be repaired by using a helicoil. If you can bring the bike into our shop we will undertake then repair and the cost will be £15.Jonathan Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted June 1, 2013 Leadership Team Share Posted June 1, 2013 Wow that's a cheap repair Stu. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 28, 2013 Author Member Share Posted June 28, 2013 Just finished reassembling. The tool was perfect. Conflicting advice on sense of thread repair. Couldn't find the replacement part (RH crank, spider and spindle) from Shimano and the whole kit (inc rings and bottom bracket) was €72 or more. Easier to find the version without a chainguard. Local bike dealer agreed to split a set and sold me just the bit I needed for £30, so I kept the old chainguard with the old outer ring. So, thanks to Warlands Cycles in Oxford, and thanks to all of you. Jonathan Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted June 28, 2013 Share Posted June 28, 2013 That's a pretty good result, well done LBS Link to comment Share on other sites More sharing options...
oilyhands Posted June 28, 2013 Share Posted June 28, 2013 Just been out to check the pedals on my XTR crankset.... Oily Link to comment Share on other sites More sharing options...
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