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Old 05-03-10, 03:53 PM   #1
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Running chainrings the other way round, flipping them over


I've tried searching around but can't find a definitive answer as to the pros and cons of running a chainring the other way round.

Obviously if it's offset/dished then it'll affect chainline. And if it's ramped and pinned then it'll not help shifting.

The bike I'm interested in this for is fixed however, though I sometimes set it up with a freewheel block at the back. Either way, the front chainring is not offset and definitely not ramped or pinned. It comes from a time before that existed. Its got an obsolete Stronglight BCD actually (122) which is why I'm interested in seeing if I can make it last longer.

Assuming, for a moment, that it was running a freewheel at the back and therefore the only wearing effect on the chainring was forwards, what would flipping the chainring over do? Is it as simple as increasing its usable life? Surely it makes a difference that the other side of the tooth is mis-shaped?

Does it make a difference if you're going to run the flipped chainring on a fixed drivetrain? I imagine not because however much you resist forward motion through the pedals it can't be as wearing as forward cos you spend most of the time going forward.

Aye, so any experience or technical wisdom would be great
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Old 05-03-10, 04:06 PM   #2
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Yes, running the chainring flipped will improve it's life as it brings fresh correctly profiled teeth to the loaded side of the chain. It doesn't help as far side wear at the points, but that should be a non-issue in SS, since there'll never be chains feeding from angles.

Either way, the one best thing you can do to prolong chainring life is to replace chains before they wear too much, and even consider rotating multiple chains every 500-1,000 miles, so you're not running stretched chains until the very end of the total life cycle. I rotate 5 chains trying to eek every last mile out of an old and not replaceable freewheel on my vintage bike. I'm about half way through, or on my 3rd pass through the chains and the freewheel looks almost new. Had I been on my third chain, each used to the end, there's no way it would be this good.

BTW- your chainring bolt head will stick out a bit because chainrings are only counter-bored on one side.
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Old 05-03-10, 04:24 PM   #3
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you might need longer chainring bolts and nuts, because the other side no longer has any counter sunk holes...
then again, some chainrings don't have counter sunk holes at all.
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