This Item Will Stop your Chain from overshooting Into The Frame

[Bill G]

I have read several post were guys have droped there chain shifting to the small ring up front. I have one of these on every bike I own and it has prevented the dreadfull chain overthrow problem so common with tandems and it is a must on any tandem or single bike. The cost is about $12.00 to $15.00 and it come in three diffrent sizes for diffrent seat tube sizes( sizes listed below). Adjust it like the derections say along with a properly adjusted front derailleur and of you go, I have not thrown a chain since this was installed, it is a paint saver.

Sizes, 28.6mm or 1.125", 31.8mm or 1.25", 34.9mm or 1.375"

I got mine at Precision Tandems and it is called a Jump Stop manufactured by N Gear. Updated or better Pics of Jump Stop added below.

Take care and ride together,
Bill G

[2372ighost]

I have these on all my bikes, one size fits all

http://www.loosescrews.com/index.cgi?d=single&c=Chain&sc=Chain%20Watcher&tc=&item_id=LS-2502HC&id=1020781753

[Bill G]

[QUOTE=2372ighost]I have these on all my bikes, one size fits all

http://www.loosescrews.com/index.cgi?d=single&c=Chain&sc=Chain%20Watcher&tc=&item_id=LS-2502HC&id=1020781753[/QUOTE

I tried the third eye and did not care for it and felt the quality and adjustability of the Jump Stop was way superior. It is made out of stainless steel and fits the exact size seat tube used without the use of a hose clamp which is used as the clamping device on the third eye, thats why one size fits all on the Third Eye chain minder.

Take care,:)
Bill G

[zonatandem]

Both accompish the same purpose: peace of mind.
Having said that, we do not use any of those devices.

[Bill G]

Both accompish the same purpose: peace of mind.
Having said that, we do not use any of those devices.

I did not care for the idea at first but it only takes throwing a chain one time ( this is somthing to think about) with the Zona carbon fiber frame a chain could do one heck of a lot of damage, also the Jump Stop looks quality not like a cheesy add on plastic part. That is why I don't care for the Third Eye chain minder as well as its lack of adjustability. The main reason I installed the Jump Stop is I have a custom flame paint job on our tandem. The frame and paint cost a fair amount of money and I did not want to take any chances on doing damage to the paint or frame if by chance the chain did over shoot for what ever reason. Better to be safe than sorry.

Take care and ride together :)
Bill G

[woog]

I got mine at Precision Tandems and it is called a Jump Stop manufactured by N Gear.
You can also get them direct from the manufacturer.

http://www.gvtc.com/~ngear/

[TandemGeek]

Just an observation: How many of the folks who use the Jump-Stop and Third Eye chain keeping devices keep or install the clear plastic spoke protector that prevents a chain from overshifting the largest rear cog and mangling the rear wheel, chain, and derailleur? If not, why not given that they perform the same function?

http://www.nashbar.com/nashbar_photos/medium/SH-SPT.gif

[Bill G]

Just an observation: How many of the folks who use the Jump-Stop and Third Eye chain keeping devices keep or install the clear plastic spoke protector that prevents a chain from overshifting the largest rear cog and mangling the rear wheel, chain, and derailleur? If not, why not given that they perform the same function?

http://www.nashbar.com/nashbar_photos/medium/SH-SPT.gif

I have never found the chain in the rear to be a problem on any bike with the derailleur limets set correctly and I do not use the plastic guard on the rear wheel. On the other hand even with the front derailleur set correctly there is that one chance in a million it will still try to derail, exspecialy on a tandem. With things adjusted properly front derailment is very rare but can happen, I choose to not take a chance.

Take Care and ride together :)
Bill G

[regomatic]

I have read several post were guys have droped there chain shifting to the small ring up front. I have one of these on every bike I own and it has prevented the dreadfull chain overthrow problem so common with tandems and it is a must on any tandem or single bike. The cost is about $12.00 to $15.00 and it come in three diffrent sizes for diffrent seat tube sizes( sizes listed below). Adjust it like the derections say along with a properly adjusted front derailleur and of you go, I have not thrown a chain since this was installed, it is a paint saver.

Sizes, 28.6mm or 1.125", 31.8mm or 1.25", 34.9mm or 1.375"

I got mine at Precision Tandems and it is called a Jump Stop manufactured by N Gear.

Take care and ride together,
Bill G

Coincidental that you post this today, we're flatlanders that only see hills on occasional tours or in outlying areas of Cental FL. We're headed for the Ga. Tandem Rally next w/e, so went to the next county west of us Saturday AM to get one last day of hill training in and threw the chain twice during the day.

I'd seen these types of devices advertised before and did some quick on-line research to determine that the Jump Stop brand was preferred as long as you have a round seat tube of the diameters listed above.

I called Tandems Limited 205-991-5519 at about 4:15 on Saturday afternoon, talked to Jack, the proprietor, and determined that this was a good product to suit our needs and that he had it in stock. I was ready to pay overnight air charges to make sure we'd have it for the for the following w/e. Jack assured me that he'd get it to the post office and send it Priority so I'd have it no later than Tuesday or Wednesday at the latest, without extra charges for air freight.

I brought the bike to my "lady tandem mechanic extraordinaire" this afternoon and she tweaked the adjustments while I waited. Jack's part was in the mailbox when I got home on Monday afternoon. It was easy enough to install but I fiddled around with it for 10 minutes or so to make sure I had it just right.

I'm pretty sure the mechanic's adjustments will get us back shifting smoothly again but we'll have added insurance with the Jump Stop.

Thanks to Jack and Tandems, Limited www.tandemslimited.com for outstanding customer service!

Total cost; parts, shipping & handling, and virtual overnight service-$14.95.

Piece of mind that we won't be jamming the chain up in the bottom bracket every time we go to the small ring- "Priceless"

[masiman]

I run the spoke protector on my MTB but not on any of my road frames, to include the tandem. Those spoke protectors always succomb to UV light. They all eventually turn yellow, crack and fall off. Cheap insurance for MTB. I hate walking out and about zero chance of catching a lift, lol.

I don't use chainkeepers of any sort, 'cept maybe runnin' the derailleur tight against the chain on the granny gear.

[jjwintski]

I have been very happy with n-gear's "JumpStop"
If you can't find it at your bike shop, you can order them directly from this website:

http://www.gvtc.com/~ngear/

A happy customer,
John

[TandemGeek]

Follow-up: For the folks who find that their tandem has a propensity for the chain to by-pass their granny (aka, alpine) chainring when shifting from the middle chainring, what type of shifters are you using?

- Bar ends
- Shimano STI
- Campy Ergo
- Other: please list

[galen_52657]

I can't remember the last time I dropped the chain shifting to little ol' granny....and I am in that ring all the time. Can't much help it with our local rolling terrain and...um....power issue??? I am running an old Campy Chorus ERGO left shifter cabled to a Shimano 105 front derailleur.

[regomatic]

Follow-up: For the folks who find that their tandem has a propensity for the chain to by-pass their granny (aka, alpine) chainring when shifting from the middle chainring, what type of shifters are you using?

- Bar ends
- Shimano STI
- Campy Ergo
- Other: please list


Shimano STI

[2372ighost]

shimano sti

[R900]

I ordered one direct for $10.40 shipped using PayPal. It's a nice piece, nylon strap and a stainless steel guard. I figured why not. I think we dropped the chain twice on our Fuji tandem (Flat bar with some lower end Shimano components). Anyway, the paint on our new Trek is so nice I figured a little protection was worth $10. I've not dropped the chain on the Trek, but now shouldn't have any problems at all.

Thanks for the tip - John