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Can i reverse my inner chainring?(7 posts)

Can i reverse my inner chainring?tobinb
Jul 18, 2003 9:38 AM
Is there a reason not to flip over the 39t inner (non ramped) chainring in order to squeeze a little more mileage out of it?
Jul 18, 2003 9:49 AM
Most I know of have little indendation around the bolt holes where the nut seats. You might have incorrect spacing if you reverse, depending upon whether the teeth are centered on the ring (don't know).

OTOH, don't be a tightwad and just go buy one.

Most chainrings have a counter sunk area......MR_GRUMPY
Jul 18, 2003 10:10 AM
for the chainring bolt. If you flip the ring, the bolt won't go into the counter sunk area, increasing the distance between rings.
Buy a new ring...........
The distance between the rings won't changeStraightblock
Jul 18, 2003 12:20 PM
The nut will protude from the ring, but that's not a problem. I've flipped chainrings to use double chainring bolts with a single chainring on a couple of occasions. With the single ring sometimes the bolt bottoms out before it gets tight, though.

Reversing a worn chainring may cause the chain to want to hang up on the hooked teeth, though.
its the trickle down effect...tobinb
Jul 18, 2003 10:41 AM
Its not like im a serious tightwad, the good stuff comes off my nice bike, onto the commuter. Hey the front halves of all those teeth still look good to me! I will post if it all goes horribly wrong...
its the trickle down effect...xcandrew
Jul 19, 2003 1:58 AM
If the chainring bolt heads don't interfere and the spacing between rings remains the same, it would be a good idea (try it?). Here are some thoughts from Sheldon and Jobst on

Most chainrings these days are not symmetrical. The teeth may not be on
the centerline, the chainwheel may even be dished. The holes for the
stack bolts are typically counterbored on one side for the heads of the
stack bolts to be recessed.

Modern chainrings for bikes with front derailers have ramps and pins on
the inboard side to improve shifting.

For tandem synch chains, a variation on this works quite well. Instead
of flipping them, however, the better approach is to swap the front and
rear, which has the same effect.

Sheldon "It's OK On Fixed Gears" Brown
Newtonville, Massachusetts

Most chainwheels are one sided with counter bores on one side only so
the screws will not fit flush and will hang up on the chain. It's not
that you can't mount them but rather that the screws interfere because
their heads protrude. You might be surprised also that a used chain
will skip on a new chainwheel, just the opposite of the rear
sprockets. The difference is that a driving sprocket engages under
load while a driven sprocket disengages under load and visa versa.

Jobst Brandt
might work on outsideoff roadie
Jul 19, 2003 10:10 PM
Others pointed out why it likely won't work as a "small ring", but you can probably flip it and put it on the OUTSIDE, as a "big ring". My commuting bike is a singlespeed mtb with a 34 t or 36 t ring on the out-most position of an old 5 arm lx crank, so potentially I could use worn MTB middle rings this way- if anybody actually used 5 bolt 34 or 36t middle rings any more.