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Old 2019-10-09, 11:31 PM   #1
Cyclophobia
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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
Cyclophobia
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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
Albertosaurus
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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
elpuebloUNIdo
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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
Garp
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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
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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!

https://www.youtube.com/watch?v=Jp_AaDfB35M
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Old 2019-10-13, 11:33 PM   #7
Cyclophobia
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Quote:
Originally Posted by jaco_flans View Post
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! https://www.youtube.com/watch?v=Jp_AaDfB35M
Thank you for all the good advice and the video instructions. I used the approach in the video but decided to first try it with red Loctite in case I ever need to remove the insert. If that fails, I will escalate to the permanent J-B Weld epoxy. I also plan to call Unicycle.com to see if they have the lock rings. I already tried calling Impact Unicycles but I was unable to find a phone number.
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Old 2019-10-15, 10:18 AM   #8
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Originally Posted by Cyclophobia View Post
Thank you for all the good advice
Just a question, why are you afraid of cycling? Don't you suffer from cyclomania, like all of us here?
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Old 2019-10-18, 12:15 AM   #9
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I dont see any case where you'd need to take that insert out of the crank. This is why I always go JB-Weld. It's in there, forever, no need to worry about the backring anymore. And if it fails, do it again!

I had to re-do one I think after a few years of abuse. But I have lots of cranks with this on.
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Old 2019-10-18, 12:47 AM   #10
Cyclophobia
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Quote:
Originally Posted by jaco_flans View Post
I dont see any case where you'd need to take that insert out of the crank. This is why I always go JB-Weld. It's in there, forever, no need to worry about the backring anymore. And if it fails, do it again!

I had to re-do one I think after a few years of abuse. But I have lots of cranks with this on.
Thank you, Jakob. I sent a message to Impact Unicycles looking for rings but I also ordered some J-B Weld. We'll see if it is as easy as you made it look in your video. Thank you for posting that.
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Old 2019-10-18, 01:25 PM   #11
elpuebloUNIdo
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Originally Posted by jaco_flans View Post
I dont see any case where you'd need to take that insert out of the crank.
My concern is still how to remove pedals when there is an insert. Is there a particular tool for holding the ring steady while loosening the pedal? I tried to remove my pedals the other day, and they just turned without un-threading. I was unable to get a "bite" on the ring with pliers. In your video, you attached two screws/bolts to a board. Is that the tool for holding the ring in place? Part of my problem is that I don't understand the mechanics of my Eiffel cranks (compared to my Nimbus cranks without inserts). Is the secret to pedal removal to keep the ring from spinning?

Sorry if I am not understanding something that has already been explained. Thanks for the help!
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Old 2019-10-18, 02:45 PM   #12
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Quote:
Originally Posted by elpuebloUNIdo View Post
My concern is still how to remove pedals when there is an insert. Is there a particular tool for holding the ring steady while loosening the pedal? I tried to remove my pedals the other day, and they just turned without un-threading. I was unable to get a "bite" on the ring with pliers. In your video, you attached two screws/bolts to a board. Is that the tool for holding the ring in place? Part of my problem is that I don't understand the mechanics of my Eiffel cranks (compared to my Nimbus cranks without inserts). Is the secret to pedal removal to keep the ring from spinning?

Sorry if I am not understanding something that has already been explained. Thanks for the help!
Why do you want to remove it ? Fix your insert with the pedal first
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Old 2019-10-18, 11:03 PM   #13
elpuebloUNIdo
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Originally Posted by bouin-bouin View Post
Why do you want to remove it ? Fix your insert with the pedal first
I want to remove the pedal. I want to replace the pedals. The OP had a different concern. My problem is not knowing how to remove the pedals.
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Old 2019-11-11, 11:20 PM   #14
Cyclophobia
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Following up on my original post, Impact Unicycles never responded to my message. However, Unicycle Dot Com sent me the lock ring to secure the insert. I used red Loctite on the insert and the lock ring so hopefully that will hold. However, I plan to use J-B Weld on the inserts if they come loose again.
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