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shimano 11 speed cranks with 2 inner chainrings?

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shimano 11 speed cranks with 2 inner chainrings?

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Old 10-11-15, 08:37 PM
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bikebreak
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shimano 11 speed cranks with 2 inner chainrings?

I have a 52-36 5800 crankset, curious if I can take off the 52 outer and put on a 38t inner ring.

The application is single speed cx, I wont be shifting between rings, just want the option of running a slightly bigger gear
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Old 10-11-15, 10:12 PM
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catgita
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Easy peasy. Small, minuscule, chance it will hit the stays if the frame was meant for smaller inner chainrings.

I had a custom aluminum frame that I converted to SS that wouldn't take a 46 on the inside (not even close), so I put it on the outside, changed the spacers on the rear axle to shift the freewheel to the right, and dished the wheel. If using a freehub, simply change the cog spacers, but don't plan a bash guard.
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Old 10-12-15, 10:08 AM
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Slash5
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I think you are going to have a heck of a time finding a 110 mm, 4 arm single speed chain ring.

Just re-reading your post, you want to add a 38 and keep the 36? Wouldn't think it is possible. Plus why bother with only a 2 tooth difference.

Last edited by Slash5; 10-12-15 at 10:12 AM.
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Old 10-12-15, 10:15 AM
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fietsbob 
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the space between the 2 chainrings of a double crank is the peoper chainline for a single speed crank..

the middle of a triple is on that chainline center. add a chainguard on the outer and a chain keeper,
to not lose the chain on the inside . riding rough courses and clearing the barriers .

consider replacing the whole crank ? there are many now for the 1 by drivetrain . resell your double to a roadie.
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Old 10-12-15, 10:18 AM
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Yes, you can easily do it. Since this will be a single-speed application the "right" way to do it is to remove the big ring and use shorter single-speed chainring bolts. But since this will be an 11-speed ring and not an SS specific ring you might be better off leaving the big ring in place or using a chain keeper/FD to prevent it from derailing.

Originally Posted by fietsbob View Post
the space between the 2 chainrings of a double crank is the peoper chainline for a single speed crank..
With today's fancy modern cassette hubs the rear cog (for single-speed use) can be placed anywhere so proper chainline is irrelevant.
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Old 10-12-15, 10:24 AM
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I expect the 11 speed cassette will pack up with mud quite nicely. and stop working , that's Cross Racing ..
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Old 10-12-15, 10:49 AM
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FastJake
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Originally Posted by fietsbob View Post
I expect the 11 speed cassette will pack up with mud quite nicely. and stop working , that's Cross Racing ..
Then it's a good thing the OP isn't using an 11-speed cassette and is instead using this for SINGLE SPEED.
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Old 10-12-15, 11:28 AM
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Jamminatrix
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Originally Posted by bikebreak View Post
The application is single speed cx, I wont be shifting between rings, just want the option of running a slightly bigger gear
You cannot.

To avoid confusion thus far, your 5800 crank is Shimano's new 110 BCD 4-bolt with offset. Finding a single speed chainring for these is near impossible. The Shimano 34T-42T chainrings for these cranks are meant for inner mounting and cannot be flipped.
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Old 10-12-15, 11:54 AM
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Originally Posted by Jamminatrix View Post
You cannot.

To avoid confusion thus far, your 5800 crank is Shimano's new 110 BCD 4-bolt with offset. Finding a single speed chainring for these is near impossible. The Shimano 34T-42T chainrings for these cranks are meant for inner mounting and cannot be flipped.
Am I the only person that's ever used a multi-speed ring for single speed use? The only potential problem is an increased risk of chain derailment, which can be easily fixed (if it turns out to be an issue) with a front derailer or chain guard.
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Old 10-12-15, 11:56 AM
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Sell the cranks & BB you can buy 2 0r 3 new Adequate cranks for the money some Upgrader will, pay you for that one ..
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Old 10-12-15, 12:04 PM
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Originally Posted by FastJake View Post
........ The only potential problem is an increased risk of chain derailment, which can be easily fixed (if it turns out to be an issue) with a front derailer or chain guard.
+1
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