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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  crank,chain ring alignment ?
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Author Topic: crank,chain ring alignment ?  (Read 535 times)

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steveb

  • Guest
crank,chain ring alignment ?
« on: January 29, 2010, 09:00 PM »
 ???     i have a felt sector cruiser and have changed the stock gearing. the std chainring had a reducer/spacer fitted. when fitting the new chainring it was already at 19mm so i am presuming i will need spacers ?  is there a way of measuring the correct amount of spacing or is it trial and error? any help or diagrams much appreciated. thanx steve.

HEYWOOD BMX

  • Guest
Re: crank,chain ring alignment ?
« Reply #1 on: January 29, 2010, 09:06 PM »
 :) Pretty much trial and error.Try adding/removing spacers on the drive side of the bb until you get a better alignment.You can also get spacers to go behind the cassette/freewheel cog if that needs bringing out a bit...

steveb

  • Guest
Re: crank,chain ring alignment ?
« Reply #2 on: January 29, 2010, 09:57 PM »
thankyou for that,is it worth measuring the amount of axel to make it exactly central or is it good enough by eye ?  last time i did all this it was a 1 piece solid crank with a spider so none of this faffing around !!!!!!!! seems a strange design to have a floating axel that is not centred ?? 

HEYWOOD BMX

  • Guest
Re: crank,chain ring alignment ?
« Reply #3 on: January 29, 2010, 10:12 PM »
 Never heard of measuring the axle is centred.A floating axle can be pretty useful as you get plenty of adjustability.No good having a centred spindle if the rear sprocket is a bit+/- :daumenhoch: I`m running a 3 pc on my bike and the alignment is perfect with no tight spots at all.

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  crank,chain ring alignment ?
 

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