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64 BCD Inner Chainring Chainguides?

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64 BCD Inner Chainring Chainguides?

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Old 10-05-14, 01:41 PM
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MisterK
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64 BCD Inner Chainring Chainguides?

ive gone single ring up front, but am using a 26t 64bcd inner ring to acheive the gearing. i like the feeling when i pedal thru gears but it has a tendacy to drop the chain up into the crank under heavy load or really bumpy trail terrain, causing the chain to get stuck between the ring and the spider which is a real PITA when it keeps happening over and over. (happens more often on smaller rear cogs).
ive been looking, but it doesnt seem like many people make a chainguide for inner ring, or as small as 26t.
what i would like is a guide with the top guide and bottom roller (for added chain tension). could any of you help guide me in the right direction (no pun intended), hopfully someone else has done this succesfully or can help remedy my issues.
my bike does not have iscg/iscg05 brackets but i have no problem buying the adapter if need be.
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Old 10-11-14, 09:01 PM
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200+ veiws and not a single reply...yet everyone wants to answer the questions of which bike is better or what old dusty CL bike should someone buy? :/
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Old 10-12-14, 12:05 AM
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Looks like the smallest easily available guides only go down to 28tooth. You might have to just start buying parts and modifying if nec as what might work will depend on the frame/BB/crank combination. Not that long ago it was common to heavily modify pretty much every chain guide to fit.

In my experience simpler is better in these situations, I've had horrible luck with chain guides. Bash guard and an inner jump stop on the seat tube works great. If you are feeling crafty I might have some old chain guide parts laying around, maybe an upper guide and back plate, perhaps some iscg adapters.

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Old 10-12-14, 10:50 AM
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Trouble with that is most backplates locate right where they'll foul with an inner ring. Generally, you can't even have inner ring bosses on the crank to use a standard guide. Wesnamyke's suggestion of a jump-stop on the inside is a good one.

There is one viable alternative I can think of - - e.thirteen's Heim 3RS guide. It's e.13's update of the old Heim 3-Guide (whom they bought out).
E Thirteen Heim 3RS Chain Guide | Chain Reaction Cycles
Is meant to work with 3-ring cranks, so spacing accommodates inner ring. It's only the lower though and not sure if you can get it close enough to your 26t to suit you.
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Last edited by dminor; 10-12-14 at 10:53 AM.
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Old 10-12-14, 04:09 PM
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Other possible options:

Switch to cranks that take splined single chainrings in place of a spider, either BMX cranks or one of the more modern mountain cranks. It would be much easier to run a standard guide with just the one ring.

MRP, problem solvers, Pauls, Gusset and maybe a few others makes an upper guide that mounts off the seat tube. Perhaps that plus one of the chainstay mounted chain tensioners would make a complete guide.

Also the new clutched derailleurs are supposed to make a huge difference in chain drop, if you are running 10spd and could easily switch to one it might be worth it.

Last edited by wesmamyke; 10-14-14 at 12:07 AM. Reason: Bleh
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Old 10-13-14, 02:45 PM
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seems the chain guides that attach to the seat tube would slide down to surround the chain on 3 sides.
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