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PostPosted: Mon Mar 04, 2013 12:40 am 
Gold Trader | rBoTM Winner
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Joined: Fri Oct 19, 2012 12:30 am
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Location: London
Hi, need some assistance.
I have some nice Specialites TA chain rings; Compact 44-94, 32-94 (and an Action-Tec Ti small ring).
Question is, what sort of Crank Arms can I add to these rings?
I was looking at Race Face Turbine's (Square taper) - do these come in different sizes?

And what's the score with matching crank arms to rings? What do the numbers mean and what should I look out for?

I haven't any crank arms as yet, so any suggestions?

These will most likely go onto a future project (a 1998 M-Trax Optima Lite I'm looking to buy, so the cranks/rings etc need to all be 90ies upto say 1998/99)


Thanks! :)


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PostPosted: Mon Mar 04, 2013 10:48 am 
Old School Grand Master
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Location: Heathfield, East Sussex
Think you'll find Raceface cranks are 104 BCD...

...you're going to be a bit limited with 94 BCD I think?


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PostPosted: Mon Mar 04, 2013 11:25 am 
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Location: High on a hill above the Somerset Levels...
I've just discovered that my Specialized Strong Arm chain set (and therefore some Sugino chain sets) is/are 94BCD :D


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PostPosted: Mon Mar 04, 2013 12:30 pm 
Gold Trader | rBoTM Winner
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Hi what do the numbers mean and what cranks could I use with these?
Cheers


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PostPosted: Mon Mar 04, 2013 12:36 pm 
Gold Trader | rBoTM Winner
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viewtopic.php?f=2&t=243624&p=1828291&hilit=Raceface+turbine#p1828291

Are these raceface turbines on this sale thread compatible?
They're advertised as 94 / 58


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PostPosted: Mon Mar 04, 2013 1:54 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
Pre-1993 cranks are typically 110/74 (110mm PCD outer & middle, 74mm centre)
Smallest ring size is 34 and 24T respectively (there are a few trick 33T rings around, and I think somebody once made a 32T)
Later 'compact' ones are 94/58. Smallest ring size is 32 and 20T respectively.
4-arm are 104.


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PostPosted: Mon Mar 04, 2013 4:48 pm 
Old School Grand Master
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ibbz wrote:
http://www.retrobike.co.uk/forum/viewtopic.php?f=2&t=243624&p=1828291&hilit=Raceface+turbine#p1828291

Are these raceface turbines on this sale thread compatible?
They're advertised as 94 / 58


Lucky find! :o

Yes, they would be ideal for what you want; the 94 is the BCD of the outer and middle chainring, 58 is the BCD of the inner/granny ring.

BCD = Bolt Circle Diameter in mm

http://sheldonbrown.com/gloss_bo-z.html


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PostPosted: Mon Mar 04, 2013 4:56 pm 
Gold Trader | rBoTM Winner
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We_are_Stevo wrote:
ibbz wrote:
http://www.retrobike.co.uk/forum/viewtopic.php?f=2&t=243624&p=1828291&hilit=Raceface+turbine#p1828291

Are these raceface turbines on this sale thread compatible?
They're advertised as 94 / 58


Lucky find! :o

Yes, they would be ideal for what you want; the 94 is the BCD of the outer and middle chainring, 58 is the BCD of the inner/granny ring.

BCD = Bolt Circle Diameter in mm

http://sheldonbrown.com/gloss_bo-z.html


Stevo mate you've cleared that up on one.
Cheers
Is that raceface a good price?


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PostPosted: Mon Mar 04, 2013 5:57 pm 
Old School Grand Master
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Location: Heathfield, East Sussex
They do tend to fetch premium prices, but if that's what you want and you don't mind paying it then yes, it's a good price...8)


Last edited by We_are_Stevo on Mon Mar 04, 2013 9:56 pm, edited 1 time in total.

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PostPosted: Mon Mar 04, 2013 6:13 pm 
retrobike rider
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Location: Yorkshire, England
Turbine come in both the standard MTB 5 arm sizes
Have a quick pop into the archive and dig the catalogues out and GPO learn a little bit about them before you plunge on and buy.
They come in square and later in ISIS bottom bracket attachments.

You'll either need the version with the granny spacers built in or make sure it comes with them.


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