Chainring: Is there an inside/outside?
02-05-09, 11:47 PM
#1
Senior Member
Thread Starter
Chainring: Is there an inside/outside?
One side has a bevel on the side, the other is flat. Which way does this install?
02-06-09, 06:46 AM
#3
Senior Member
There is inside and outside and there are a few clues to whic is which:
-- Lettering (name of manufacturer, # of teeth) generally faces out on big ring and in on little so its readable when rings are installed
-- On a big ring, look for large chainring pin, it should face out and line up with crank arm.
-- ramps to help shifting face in on big ring -- and middle ring if you are using a triple
-- Recessed bolt holes should face out on big ring and in on small ring. This allows bolt heads to seat into the machined recessed holes. If bolt heads don't seat, flip the ring
-- Lettering (name of manufacturer, # of teeth) generally faces out on big ring and in on little so its readable when rings are installed
-- On a big ring, look for large chainring pin, it should face out and line up with crank arm.
-- ramps to help shifting face in on big ring -- and middle ring if you are using a triple
-- Recessed bolt holes should face out on big ring and in on small ring. This allows bolt heads to seat into the machined recessed holes. If bolt heads don't seat, flip the ring
Last edited by DOS; 02-06-09 at 10:08 AM.
02-06-09, 08:24 AM
#4
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In addition to the above:
The middle ring tends to have the teeth set a bit towards the large ring.
I've seen Bontrager? compact cranks where the big ring was actually set to the outside of its mounts (like a shallow cone rather than a plane). Putting it on backwards left it seated funny and nearly on top of the smaller ring. Also, some chain rings have a little arrow stamped into the inside. That arrow lines up with the crank arm if it is between the bolt holes, and opposite the crank arm if it is directly above a bolt hole.
The middle ring tends to have the teeth set a bit towards the large ring.
I've seen Bontrager? compact cranks where the big ring was actually set to the outside of its mounts (like a shallow cone rather than a plane). Putting it on backwards left it seated funny and nearly on top of the smaller ring. Also, some chain rings have a little arrow stamped into the inside. That arrow lines up with the crank arm if it is between the bolt holes, and opposite the crank arm if it is directly above a bolt hole.
02-06-09, 09:33 AM
#5
mechanically sound
The countersunk side of the hole faces away from the spider. FWIW I use one installed backwards for a singlespeed and it seems to work fine.
