MuddyMike Posted November 21, 2014 Posted November 21, 2014 Hi Guys, I am building a nice bike for my son, but unfortunatley you cant get decent parts for a smaller people. A 175mm crank isnt going to help him at all..... I want to shorten the crank arms of a new Deore crank but need to know if this possible and if so does anyone know of an engineering company that could cut and thread crank arms for pedals? Is the new Deore crank solid or hollow? Any advice would be welcome.
droo Posted November 21, 2014 Posted November 21, 2014 2 things - one, you'll need to find a crankset without hollow arms. Two, you'll need to get a bike shop to do the tapping for you, because the thread on a left hand crank is unique to left cranks. Park Tool make a tap, but it costs a small fortune.
Captain Fastbastard Mayhem Posted November 21, 2014 Posted November 21, 2014 How short are you looking at going to?
MuddyMike Posted November 23, 2014 Author Posted November 23, 2014 How short are you looking at going to?around the 150mm mark.
Ampandy Posted November 23, 2014 Posted November 23, 2014 I specialise in aluminium fabrication and welding. It is possible and no real fancy or special tools are required other than the left hand tap wich I am sure I have as have lengthened crank arms before.
Skylark Posted November 23, 2014 Posted November 23, 2014 I think 160mm is the smallest commonly avail mtb crank that's made, Shimano makes it I think. Have a look on eBay for that kind of stuff.
MuddyMike Posted November 24, 2014 Author Posted November 24, 2014 I specialise in aluminium fabrication and welding. It is possible and no real fancy or special tools are required other than the left hand tap wich I am sure I have as have lengthened crank arms before. Thats great news, so if I can find a suitable crank you can do the rest? I will send you a pm. CheersMichael.
TheV Posted November 24, 2014 Posted November 24, 2014 How short are you looking at going to? Not short enough for you... we all know you are only 1.3m tall.
The MTBer Posted November 24, 2014 Posted November 24, 2014 Check www.oddwheel.co.za, maybe a Unicycle crank would work.
MuddyMike Posted November 24, 2014 Author Posted November 24, 2014 It looks like Ampandy has a solution for me....surgery time...I will report back...... The hub is full of whizzkids......
Captain Fastbastard Mayhem Posted November 24, 2014 Posted November 24, 2014 Not short enough for you... we all know you are only 1.3m tall.Coupled with my love for pies, that's a recipe for disaster. Though I must say, it affords a rather... advantageous... viewing perspective when concerning the fairer sex
unishaun Posted November 24, 2014 Posted November 24, 2014 Check www.oddwheel.co.za, maybe a Unicycle crank would work. Wont work, you cant mount the chainring onto a uni crank
darthmuller1 Posted November 24, 2014 Posted November 24, 2014 OK, I have some solid advice here. I have done this before, but not specifically on the crank mentioned. Firstly, the LBS will make a mess of it!!!! It needs to be done on a Bridgeport mill or alike, clamped and set up perfectly square and drilled and then tapped in that same position with right and left hand taps. It is critical that the pedal spindle is parallel with the BB spindle. The 'seat; area needs to be milled with a end mill slightly larger diameter than the diameter of the clamping face of the pedal spindle. Most cranks are curved.
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