30 teeth front ring.

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This topic has 17 replies, 13 voices, and was last updated 12 years ago by nikk.

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30 teeth front ring.
juan
Free Member

Does such thing exist?
I’d love one 😀

Posted 12 years ago

Stoner
Free Member

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 12 years ago

shaggy
Full Member

Get an old 5 arm crankset or spider. I’m running middleburn 20,30,40 on a Surly Mr Whirly. It’s great.

Posted 12 years ago

FGF 701 The Hydrate Or Die Edition

bikewhisperer
Free Member

Middleburn do them.

Posted 12 years ago

shaggy
Full Member

The 4 arm 30t chain rings often require the crank to be ground down.

Posted 12 years ago

cookeaa
Full Member

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 12 years ago

Trimix
Free Member

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 12 years ago

messiah
Free Member

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 12 years ago

Stoner
Free Member

doh I forgot to mention in my post that those xtralite ones are 30T.

Posted 12 years ago

Stevelol
Free Member

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.htm

I 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 12 years ago

cookeaa
Full Member

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 1×10 drivetrain (Perhaps using a certain 9-36t Cassette?)

Posted 12 years ago

honourablegeorge
Full Member

Ten helpful responses and nobody telling him to MTFU? WTF?

Posted 12 years ago

cookeaa
Full Member

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 12 years ago

RestlessNative
Free Member

you can get down to a 29t with 5 arm 94bcd, have one in my spares waiting for the right project

Posted 12 years ago

juan
Free Member

Cheers everyone I’ll see if the LBS can have them 😀

Posted 12 years ago

njee20
Free Member

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 12 years ago

GlitterGary
Free Member

MTFU. 52 teeth for real men.

Posted 12 years ago

nikk
Free Member

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 12 years ago