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Chain rings on 6 speed drivetrain

Old 03-01-18, 09:48 AM
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Phamilton
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Chain rings on 6 speed drivetrain

52/42, 110 BCD
6 speed 14-28
Can any 45T 110 BCD 5 bolt ring be swapped with the 52T or do considerations need to be made for intended application? Many 45T that I have found for sale online state for BMX/FG/track.

Joseph
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Old 03-01-18, 10:29 AM
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Originally Posted by Phamilton View Post
Many 45T that I have found for sale online state for BMX/FG/track.
Then they might be intended for use with a single-speed chain whose internal width between plates would be 1/8". Chains made for derailleur drivetrains are a little bit narrower (3/32") and a thicker chainring might be problematic.
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Old 03-01-18, 10:32 AM
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every thing is simple with friction shifting..

look for Surly stainless steel chainrings, they are not 1/8" thick .. ask your local bike shop to order one.

Obviously you lower the FD.. though you may find it wont go far down before FD tail hits chainstay..

and may not fit as well on 45,42 double ,, maybe a 34, 45?

'
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Old 03-01-18, 10:47 AM
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If you wouldn't mind 46 teeth instead of 45, you may find that you have more options. 46 is a common outer chainring size for cyclocross setups.

Bikewagon is selling a 46-tooth, 5-hole, 110 BCD, Shimano Deore chainring for $11.99 with free shipping:
https://www.ebay.com/itm/Shimano-Deo...y/372227912454
Shimano Deore 46T Chainring 110mm BCD Silver Alloy | Bikewagon.com
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Old 03-01-18, 11:28 AM
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Chainrings designed for 1x systems likely won't shift very well. I'd think it would ruin the point of what you appear to be trying to accomplish, especially since 52-42 is already a reasonable 1.5-step on a typical 14-28 freewheel.

You could look for a custom chainring maker, or look around for other odd sizes and shift the range slightly (i.e. use a Surly 47T with a 44T).
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Old 03-01-18, 02:38 PM
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they Surly Stainless, are not significantly different from the chainrings from back in the 5 speed freewheel era,

I toured for decades on old style steel chainrings, my touring triple..

it does need you to think ahead.. , read the terrain, get into the gear you need just before you hit the hills..

friction shifting needs rider involvement..




FWIW there are a few gear box cranks , 1 chainring, connected to the gear box , not directly to the crank arms,

so they can turn at different rates.

28t + the overdrive gear.. acting like a 45, in one, or a 40 & 50t in another..
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Old 03-01-18, 02:39 PM
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Originally Posted by fietsbob View Post
maybe a 34, 45?
+1. 34T rings can be found so cheap that a 46/34 setup would be pretty easy to put together.
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Old 03-01-18, 02:50 PM
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Punch cut tooth Sugino chainrings are indeed cheap..
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Old 03-01-18, 03:56 PM
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Your current FDER "might" not work well with only a 3T difference between rings.
I have a 4T & 6T differences between middle & large rings on my bikes.
The 6T shifts fine. The 4T need a bit of "help".
Cranks/rings are otherwise identical. FDER's designed for 10ish T diff.
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Old 03-04-18, 10:43 AM
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Rings intended to be run as a middle ring may be counterbored for the bolts on the wrong side when run as an outer ring. Vintage rings that lack the modern ramps and pins that facilitate indexed front shifting are probably best for this application.
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