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New School BMX 2004 - Now => New School Park, Street & Dirt => Topic started by: kev-s on September 27, 2012, 07:33 PM

Title: spline drive set ups
Post by: kev-s on September 27, 2012, 07:33 PM
just fitted a s&m L7 spline drive chainring and a set of profile no boss cranks to my bike 8) 8)


(http://www.radbmx.co.uk/archive/albums/1003/escrs/IMAG0584.jpg)


i was wondering who else on here has gone spline drive? i know olly (mdbh) has

chain tension is now perfect and equal through a whole rotation of the cranks, no more tight and slack spots 8) 8)



Title: Re: spline drive set ups
Post by: Betty on September 27, 2012, 11:27 PM
Great for getting chain alignment spot on  :daumenhoch:

They should have done this years ago, i'd be all over a spline drive 44t ripsaw  ;D

Title: Re: spline drive set ups
Post by: kev-s on September 28, 2012, 04:34 AM
 :LolLolLolLol: that would be cool

Title: Re: spline drive set ups
Post by: john4130 on September 29, 2012, 04:43 PM
got a home made 18t one on my flatland bike, the hole is not quite centre so it has a tight spot and a really slack spot.  :D
Title: Re: spline drive set ups
Post by: HUTCHMAN on September 29, 2012, 04:55 PM
my Jad cranks are like this...circa 2003.  love em.
Title: Re: spline drive set ups
Post by: Mdbh on October 03, 2012, 09:06 PM
Best thing I've bought in a long time! But mine is profile so Not sure on your s&m crap tho! :LolLolLolLol:
Title: Re: spline drive set ups
Post by: kev-s on October 03, 2012, 09:59 PM
shut it you, nothing wrong with s&m, better than those shonky old haro's :LolLolLolLol:
Title: Re: spline drive set ups
Post by: evamedia on October 04, 2012, 08:43 AM
Run one for probably about 4 years, nae bother
Title: Re: spline drive set ups
Post by: GaryN on October 04, 2012, 12:14 PM
I like the idea of the spline drive set-up, makes a lot of sense when you think about.

I might consider one of those for my Failure which runs WTP Royal cranks as and when the current sprocket is had it.
Title: Re: spline drive set ups
Post by: Mdbh on October 04, 2012, 12:32 PM
Thought we where talking ns Kev? My brake mounts don't snap off :LolLolLolLol:
Title: Re: spline drive set ups
Post by: lodge on October 04, 2012, 12:42 PM
are the spline drive sprockets compatible with the std profile axles?
Title: Re: spline drive set ups
Post by: kev-s on October 04, 2012, 12:58 PM
replaced for free even when out of warranty so not bothered :LolLolLolLol:


spline drive can be used on any 48 spline 19mm axle although its not recommended to be used on ti axles
Title: Re: spline drive set ups
Post by: evamedia on October 04, 2012, 01:32 PM

spline drive can be used on any 48 spline 19mm axle although its not recommended to be used on ti axles

Been running a tree sprocket (first ones to do a spline I think) on a ti axle for years, I am only 10 stone though
Title: Re: spline drive set ups
Post by: TwoBobRob on October 04, 2012, 01:34 PM
I like the design principle.

Anyone had any trouble when/if they run loose - they must fret away pretty quick I would have thought?

Title: Re: spline drive set ups
Post by: Gary72 on October 05, 2012, 09:29 PM
I like the design principle.

Anyone had any trouble when/if they run loose - they must fret away pretty quick I would have thought?


I dont see why they would fret away, They have a steel insert. Or do you mean the junction between the insert and the sprocket gets movement.
Title: Re: spline drive set ups
Post by: TwoBobRob on October 06, 2012, 12:11 PM
48 spline crank arms have been know to loosen and wobble through fretting. The splines are pretty fine after all. If that sprocket is say 8mm thick, it's still having to transmit the same horsepower as 20-25mms worth of crank arm spline.

Title: Re: spline drive set ups
Post by: kev-s on October 06, 2012, 02:19 PM
rob the worse case scenario if it does begin to wobble and depending on what is actually worn

new axle 48 spline 19mm is £20

or a new spline drive insert (kinda like a top hat washer) should be no more than £10

they are very tight to get on, you have to place them on the end of the axle then put a 19mm socket over the spline insert and hammer it on, so i cant see it moving much tbh esp on a park bike, race bike maybe different :daumenhoch:
Title: Re: spline drive set ups
Post by: Gary72 on October 06, 2012, 02:25 PM
I can see what your saying Rob, But is it not the taking off and re-fitting that causes the wear/wobble. I've got an older set of profiles that the arms slide off and on without any tools but still dont wobble yet.
Title: Re: spline drive set ups
Post by: TwoBobRob on October 06, 2012, 04:14 PM
Alrighty.

Clearly no real problems to speak of then.

Gary, your old cranks would surely wobble if the bolts were left loose for any length of time.


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