Shredded drive side crank thread
Sewinman
Posts: 2,131
I swapped pedals yesterday and obviously managed to cross-thread the pedal. After 5 mins of riding there was a wobble, so I headed home to swap bikes. Took a look and the thread was completely gone in the crank arm and the pedal forlornly flopped onto the street. I imagine a new chainset is required...so wondered roughly how much is it going to cost to fix at an LBS? Just so I don't get ripped off.
Its a Trek 1.2, so I won't be buying an expensive chainset.
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Naaah, you can get these helicoil things that go into the crankarm to restore the thread. Just take it to the LBS. Should be cheap.Faster than a tent.......0
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should be fixable in the short term but id consider eyeing up a sram apex chainset. great value for moneyBMC TM01 - FCN 0
Look 695 (Geared) - FCN 1
Bowman Palace:R - FCN 1
Cannondale CAAD 9 - FCN 2
Premier (CX) - FCN 6
Premier (fixed/SS) - FCN30 -
Do the Helicoils last long?
Thanks for the advice.0 -
spasypaddy wrote:should be fixable in the short term but id consider eyeing up a sram apex chainset. great value for money
Presumably that would not work with a Shimano Sora chainset etc?0 -
Sewinman wrote:Do the Helicoils last long?
Thanks for the advice.0 -
I'm pretty sure you need a new bikeRule #5 // Harden The Feck Up.
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.0 -
Sewinman wrote:spasypaddy wrote:should be fixable in the short term but id consider eyeing up a sram apex chainset. great value for money
Presumably that would not work with a Shimano Sora chainset etc?BMC TM01 - FCN 0
Look 695 (Geared) - FCN 1
Bowman Palace:R - FCN 1
Cannondale CAAD 9 - FCN 2
Premier (CX) - FCN 6
Premier (fixed/SS) - FCN30 -
I rang my local LBS and they had never heard of a helicoil and 'could not do anything' with broken threads.0
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Try a different shop, failing that any good small engineering firm will know and might have the tools - although the size is pretty bike specific.
The tools needed are the Helicoils + the right tap and tool to put it in, it looks like this:
http://www.ebay.co.uk/itm/Unior-Pedal-T ... vi-content0 -
Sewinman wrote:I rang my local LBS and they had never heard of a helicoil and 'could not do anything' with broken threads.
Given even me, with my mechanical averageness, has heard of a helicoil then there is no way I'd trust a shop that hasn't heard of one to even fit a bell to my bike.......Faster than a tent.......0 -
+1..... Even DDD has heard of a helicoil!Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0
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Proving harder than I hoped...I tried 3 others and none of them do helicoils or seemed to not know what they were and said they would need to look at it. I spoke to Moores, Twickenham, Action Bikes, Whitton, The London Bicycle Repair Company, The Cut and Evans, The Cut.0
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If you're not capable of doing a Helicoil yourself take it to a car mechanics. They'll be set-up to do it as they probably repair stripped spark plug threads from time to time. IIRC cranks are an M12 thread which I think is about the size of a spark plug. It should take no longer than 15 minutes for a competent mechanic to do it.
It's not difficult to do yourself but can be expensive as you'll need to buy a special thread tap. You can buy kits for £35 if you do go down the route of repairing it yourself.0 -
Sewinman wrote:Proving harder than I hoped...I tried 3 others and none of them do helicoils or seemed to not know what they were and said they would need to look at it. I spoke to Moores, Twickenham, Action Bikes, Whitton, The London Bicycle Repair Company, The Cut and Evans, The Cut.FCN3: Titanium Qoroz.0
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Sewinman wrote:Proving harder than I hoped...I tried 3 others and none of them do helicoils or seemed to not know what they were and said they would need to look at it. I spoke to Moores, Twickenham, Action Bikes, Whitton, The London Bicycle Repair Company, The Cut and Evans, The Cut.
I forget you are in London. If you cross thread a crank in London you are supposed to sort it buy buying a new Dogma. Don't you know anything?TGOTB wrote:Sewinman wrote:Do the Helicoils last long?
Good point - maybe he just needs to ask his Missus!Faster than a tent.......0