Does such thing exist?
I'd love one 
Bike Forum
30 teeth front ring.
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Posted 4 months ago #
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how many arms on your crank?
I have an xtralite one on an old XT 5 arm 94BCD
and druidh linked to this 4 arm 104 BCD the other day.
It woudl appear they only do 104mm BCD nowadays though
http://www.extralite.com/index_euro.htm
Posted 4 months ago # -
Get an old 5 arm crankset or spider. I'm running middleburn 20,30,40 on a Surly Mr Whirly. It's great.
Posted 4 months ago # -
Middleburn do them.
Posted 4 months ago # -
The 4 arm 30t chain rings often require the crank to be ground down.
Posted 4 months ago # -
They were common on old 5 arm compact cranks, I used to have a TA one about 16 years ago I'm sure...
you'd be too close to breaking through the tooth profile with the chainring bolt hole on a 104 PCD ring, hence 32t seems to be about the lower limit for current "Normal" 104/4 arm cranks
Theres always Middleburn cranks...
Posted 4 months ago # -
Looking at my SLX crank arms I dont see enough clearance and Im running a 32. Any smaller and the spider will hit the chain.
You can go ten speed and 36 at the rear though. Or have you done that already.
Posted 4 months ago # -
31 from here - but you still might need to modify the crank.
http://www.homebrewedcomponents.com/store.php/products/aluminum-104bcd-4-bolt-chainrings
Posted 4 months ago # -
doh I forgot to mention in my post that those xtralite ones are 30T.
Posted 4 months ago # -
Yep, I have one on each of my 2 bikes.
Andersen machine
http://andersenmachine.wordpress.com/product-info/Extralite
http://www.extralite.com/Products/octaramps_anglo.htmI prefer the andersen machine personally, it just seems a bit more robust, that being said, I have no complaints on either of them.
As mentioned, bother have required me to file away a bit of material from the spider on my xt m770 cranks.
Posted 4 months ago # -
I suppose you could mount something off of the 64 PCD granny tabs if it a bit of return to bring it back closer to the middle ring position so the chainline makes sense...
Or is that just a bad idea?I'm assuming this question has been raised by the idea of a for a 1x10 drivetrain (Perhaps using a certain 9-36t Cassette?)
Posted 4 months ago # -
Ten helpful responses and nobody telling him to MTFU? WTF?
Posted 4 months ago # -
in fact thinking about it some more why even go to the faff of making a whole special ring when you could make a 64 PCD/4 arm "Granny adapter" that let you bolt a 5 arm 94 PCD chainring on?
Must be achievable...
Posted 4 months ago # -
you can get down to a 29t with 5 arm 94bcd, have one in my spares waiting for the right project
Posted 4 months ago # -
Cheers everyone I'll see if the LBS can have them
Posted 4 months ago # -
Extralite do the Octaramp Gara to allow you to run smaller rings and offset them, or they do the 30t Octaramp up there. I used to use those (and file the spider accordingly) and they weren't bad.
Not an LBS job though - order direct from Extralite.
Posted 4 months ago # -
MTFU. 52 teeth for real men.
Posted 4 months ago # -
MTFU. 52 teeth for real men.
Among permanent teeth, 16 are found in the maxilla and 16 in the mandible, for a total of 32.
32 FTW, unless you are a shark...
Posted 4 months ago #
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