cheap BIN syncros alu cranks

[Anthony]

Do you think it's a coincidence then that the protrusions on the inner edge of the rings are always aligned under the crank arm in all Shimano drawings?
http://cycle.shimano-eu.com/media/techd ... 704680.pdf
http://www.paul-lange.de/fileadmin/paul ... -IG-96.PDF

Who said anything about Shimano? We're talking about 5 bolt Syncros and Race Face middle rings here. Both have 4 ramp pins and machined ramps on the middle rings, while the outer rings have 10 machined ramps. No matter which of the 5 mounting options middle relative to outer you chose, they will always line up to each other's ramp pattern the same, only the pattern will be rotated 72 deg. to the axis of the crank arm from the previous one. Which ramp pins are (or aren't) lined up to the crank arms (none will line up on the Race Face) means nothing.

There is nothing magic about Syncros crank arms that affects the way RaceFace rings work. The ring doesn't care what brand of crank you bolt it on to, it's the ring that does the work not the crank arms. It just needs to be aligned correctly. The alignment points on the inner edge of the middle and inner rings are there to be lined up under the crank arms (or opposite if the crank is a Sugino pattern). If that wasn't necessary, they wouldn't be there at all.

 

[sinnerman]

...£40.00, :shock: