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Old 2019-10-09, 11:31 PM   #1
Join Date: May 2015
Posts: 8
Impact DD Cranks with Missing Locking Rings

My college unicyling club has several Impact unicycles with DD cranks. We noticed that these cranks have a pedal thread insert with a locking ring on the far side. Some of these locking rings are missing and one of the pedal inserts is backing out along with the pedal. The locking ring is round with a 15/16 inch diameter. It is smooth on the outside circumference and threaded on the inside to fit on the adapter that the pedal screws in to. There are two pin holes on one side of the locking ring so that a spanner can be used to thread it on to the adapter.

Could someone please tell me where I can buy these locking rings?
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Old 2019-10-11, 11:33 PM   #2
Join Date: May 2015
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I took a picture and uploaded it here. On the upper pedal you can see that each standard 9/16" pedal has a threaded bushing on it that threads into an oversize hole in the crank. On the bottom pedal you can see that the bushing has a different thread pattern that fits the internally threaded ring.

Does anyone know what these rings are or where I can buy more? I can take more measurements or pictures if it would help. Does anyone have these on their cranks?
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Old 2019-10-12, 01:34 AM   #3
Join Date: Jun 2019
Location: Biddeford, Maine, USA
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I'm unsure about the thin lock ring. I would suggest contacting Impact customer support through their manufactorers web site, or possibly even unicycle.com - however I'd be surprized if they suggested anything other than replacing both the crank arms and the pedals. That is ultimately the proper repair proceedure.

Last edited by Albertosaurus; 2019-10-12 at 01:39 AM. Reason: Unecissary wording
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Old 2019-10-12, 01:00 PM   #4
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I think these are Impact Eiffel cranks, no? I have a pair of 150s on my trials. The locking rings have two little divots built into them, which leads me to believe there's some sort of tool for loosening the rings. I tried a couple times, using a lot of force from a long pedal wrench, to loosen the cranks. I was unsuccessful. My pedals are due for a change, now, and I'm not sure what to do. If anyone on the forum can solve the locking ring mystery, it'd be much appreciated!
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Old 2019-10-12, 01:59 PM   #5
aspiring flatlandist
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Since Impact is owned by UDC, your best bet would be to ask Roger Davies.
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Old 2019-10-12, 08:53 PM   #6
Trials & Muni!
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Location: Québec,Canada
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Rings will always end up coming out. Try the JB-Weld solution, I've done this on many many many cranks for years. So far so good!

Jakob F.
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cranks, impact, locking, missing, rings

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