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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  3 piece crank issue
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Author Topic: 3 piece crank issue  (Read 1318 times)

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oldskooldayz

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3 piece crank issue
« on: January 24, 2011, 07:47 PM »
Hi peeps little issue here

For some reason when i set up my cranks and chain wheel the chain wheel is off like on a wobble
I'm adding the shims but to no joy it still seems out

Any suggestions please

I've never had thus before

Offline brettypeeps

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Re: 3 piece crank issue
« Reply #1 on: January 24, 2011, 08:04 PM »
What cranks and what chainwheel fella.  Do you need a nineteen to 22mm adapter?

oldskooldayz

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Re: 3 piece crank issue
« Reply #2 on: January 24, 2011, 08:13 PM »
new oldskool redline proline 180mm single pinch and no adaptor needed

im useing a power disc and 44 chainwheels

nosepickben

  • Guest
Re: 3 piece crank issue
« Reply #3 on: January 24, 2011, 08:30 PM »
I had this, used a combination of a shims on axle + drive bolt to get line right. Still not 100% but good enough for action.
Largeflat thin shim on spindle then what i think was a 10mm wheel axle washer as shim between drive bolt + crank arm. gave me spot on chain line + near enough dammit no sprocket wobble on crank arm. Took time tho bro and a lot of washer hunting+ modyfying with crappy file. good luck, you'll get there.

oldskooldayz

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Re: 3 piece crank issue
« Reply #4 on: January 24, 2011, 09:19 PM »
I had this, used a combination of a shims on axle + drive bolt to get line right. Still not 100% but good enough for action.
Largeflat thin shim on spindle then what i think was a 10mm wheel axle washer as shim between drive bolt + crank arm. gave me spot on chain line + near enough dammit no sprocket wobble on crank arm. Took time tho bro and a lot of washer hunting+ modyfying with crappy file. good luck, you'll get there.

sounds like this is what i will have to do from your explanation

i might even just put a 1 piece in cause im a lazy fooker  :2funny:

no i will give it shot first and when it feels like im about to throw the bike out the window i will put the 1 piece on  :D

cheers

Offline brummie

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Re: 3 piece crank issue
« Reply #5 on: January 24, 2011, 09:26 PM »
new oldskool redline proline 180mm single pinch and no adaptor needed

im useing a power disc and 44 chainwheels

i have a set of these and needed a tophat washer for my powerdisc

Offline brettypeeps

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Re: 3 piece crank issue
« Reply #6 on: January 24, 2011, 09:33 PM »
I agree with Brunmie you will normally need a top hat washer. Gets the spacing correct and keeps the power disk central. Axle is 19mm and power disk 22mm. I might have a spare you can have foc

See if the disk rattles about on the axle and let me know if you need it and I will have a look for it :daumenhoch:

oldskooldayz

  • Guest
Re: 3 piece crank issue
« Reply #7 on: January 24, 2011, 10:21 PM »
right silly me yep defo needed that washer that slips in the disc to stop it moving all over the place  :-[

ive got it down now to a 3-4 mm wobble so i will play about with the shims till i get it spot on or really close

Big thanks for the offer on the top hat washer foc mate  :daumenhoch:

thanks for the advice guys and next time i will check the full contents of the box before installation  ::)  ;)  :daumenhoch:
« Last Edit: January 24, 2011, 10:23 PM by oldskooldayz »

HEYWOOD BMX

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Re: 3 piece crank issue
« Reply #8 on: January 24, 2011, 10:49 PM »
 :) I ran a powerdisc with twincgh-pinch Flights and needed a 23.8mm-19mm tophat washer :daumenhoch:

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  3 piece crank issue
 

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