I am need of new crank bolts, as I have had a number of bolts work their way loose, and am trying to work out what bolt I need. The plethora of options online is not making it easy, and I am not aware of any local shops that carry what I need (Halfords and Evans don't stock them, and aren't all that knowledgeable about e-bikes anyway).
My main commuter bike is a KTM Macina Action (2014) with the Bosch Activeline drive. My other bike is a Scott eGenius 730 (2017) with the Performance CX drive (and I mention that because I am able to swap crank bolts between the two).
I use Miranda crank arms and a mix of Miranda and non-Miranda bolts. These M15 bolts look correct:
However, there do not seem to be any size markings on the bolt I have left (just a Miranda part code, which is mostly unreadable). Some bolts seem to put the size in the key well, but this one does not.
I know that the bolt is not an M12, as I have that for my old Bosch Classic drive bike, and that one is definitely too small.
I have seen some M14 bolts online, as that is a size slightly bigger than the M12 that might plausibly fit. However this Miranda site does not list a M14, which leads me to think that the M15 is what I need:
I would happily measure my last bolt, but I am not sure what dimension the "M" refers to - anyone know?
These M15s also look suitable, and are sold in pairs. There is no mention of e-bikes or Bosch though:
www.chainreactioncycles.com
They are also available in M14, which makes me cautious, in case that is what is required.
How can I narrow down what I need? (What would be great is technical model specification documentation from bike manufacturers, available even for historical models, but I don't think I have ever seen such material go into the level of detail that would be necessary in this case).
If any UK suppliers here carry what I need, feel free to link to your product page, or otherwise supply details. Thanks!
My main commuter bike is a KTM Macina Action (2014) with the Bosch Activeline drive. My other bike is a Scott eGenius 730 (2017) with the Performance CX drive (and I mention that because I am able to swap crank bolts between the two).
I use Miranda crank arms and a mix of Miranda and non-Miranda bolts. These M15 bolts look correct:
However, there do not seem to be any size markings on the bolt I have left (just a Miranda part code, which is mostly unreadable). Some bolts seem to put the size in the key well, but this one does not.
I know that the bolt is not an M12, as I have that for my old Bosch Classic drive bike, and that one is definitely too small.
I have seen some M14 bolts online, as that is a size slightly bigger than the M12 that might plausibly fit. However this Miranda site does not list a M14, which leads me to think that the M15 is what I need:
I would happily measure my last bolt, but I am not sure what dimension the "M" refers to - anyone know?
These M15s also look suitable, and are sold in pairs. There is no mention of e-bikes or Bosch though:
FSA ISIS Crank Arm Mounting Bolt | Chain Reaction
Buy your FSA ISIS Crank Arm Mounting Bolt from our Chainsets & Cranksets range at CRC. £6.99. Free delivery available.
They are also available in M14, which makes me cautious, in case that is what is required.
How can I narrow down what I need? (What would be great is technical model specification documentation from bike manufacturers, available even for historical models, but I don't think I have ever seen such material go into the level of detail that would be necessary in this case).
If any UK suppliers here carry what I need, feel free to link to your product page, or otherwise supply details. Thanks!
