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Single front ring question...(12 posts)

Single front ring question...Mitch2
May 28, 2002 9:31 PM
I am trying to run a single chain ring up front and I would like to know what is the most cost-effective way to do this.
What do you guys use to hold that chain in place?

Thanks
Mitch
Venice, Ca
re: Single front ring question...muncher
May 29, 2002 7:24 AM
Mitch,

Not sure I understand the question. Why would you need anything to hold the chain in place? If you are running a normal derail system on the rear, then providing you are running a sensible size ring up front (i.e. not too "crossed" big front small rear), and you don't have a really short rear triangle then there should be no problem.

If you are running too wide a block on the back to that you can't cover the range without throwning the chain in/out off the front ring, the only option you have is a smaller front ring as above some form of guide, that is going to make a helluva racket to keep the chain on.

FWIW I can run the whole of the rear on my middle (40T) ring on my racing triple Jake, no probs.
re: Single front ring question...Mitch2
May 29, 2002 5:49 PM
Muncher,

The place I ride( Santa Monica Mountains) gets pretty rough during high speed downhill runs and my chain just pops off the ring(32t)I love this setup because I do a lot of climbing but when the going gets rough the chain can't hold on. I just need something that can hold the chain in place.

Happy Trails,
Mitch
Venice, Ca
Aaah - I see -muncher
May 30, 2002 2:21 AM
You are riding some more extreme rocks than me!

I wonder if a low cost solution could be to get 1 of those adjustable jockey wheels (Rollamajigs?) that people use for tension on single speeds and rig it to the top of the chain stay - I would guess that would keep enough tension on the chain to keep in on? Might be worth a go.

Or failing that - just get a couple of Al discs and bolt them on the inside and outside of the front ring - should be possible with a bit of thought and a Dremmell?
That's what I need....Mitch2
May 30, 2002 4:58 AM
A Dremell tool! I should have invested in that tool a long time ago. I guess I will hold off on purchasing anymore parts and just get a Dremell and start grinding.

Thanks Guys!
re: Single front ring question...ralbert
May 29, 2002 8:08 AM
Cyclocrossworld.com sells kits with a ring and either 2 TA chainring guards, or a Spot guard for the outside and a "third eye" chain watcher for the inside.

the TA kit is the cleanest looking, as there's nothing on the seattube, but you probably need new chainring bolts to hold all 3 things (2 guards and 1 ring).

the Spot guard and the third eye watcher is nice because if you already have a double chainring setup, you just replace the outer ring with the guard.

both are used by pros--gullickson uses the spot system and others use the TA.

I think the Spot + third eye is a few dollars cheaper (i think $70 for the Guard, ring and watcher)
re: Single front ring question...Mitch2
May 29, 2002 5:51 PM
Ralbert,

I did check their website and that was a cool setup but it cost sooo much money. I might try the Spot chain guard and the 3rd eye? and see how it goes. It's sure a lot cheaper and it might work.

Happy Trails,
Mitch
Venice, Ca
even cheaperpauly
May 30, 2002 3:50 AM
Grind down the teeth an old worn out chain ring (one that is a lot bigger than the one you are running). I did that for awhile with third-eye type device on the inside and it worked fine.
even cheaper (but I'll pass on the 3rd Eye)triangleforge
May 30, 2002 8:31 AM
I did the same for an outside chain-guard on a Single-speed MTB. It speeds the process a bit to break off the teeth with a pair of vice grips before you commence to filing or grinding.

As for the 3rd Eye, I think I'm going to pass on it this season; in the final race of the 2001 VA Cross series, I crashed on the last lap and somehow my chain got yanked off the ring and UNDER the 3rd Eye. It took me a good 60 seconds of cursing and frantic yanking to get the chain out from under there and back on the chainring, while watching the guy who was 25-30 seconds behind me (with maybe 4 minutes left to the line) go by me for good. Of course, with me placing right behind him in that final race, he moved into 10th and bumped me to 11th in the series standings. So, you see, I'm a tad bitter... Was it a freak occurence, never to be repeated? Maybe. Probably. But whenever I've lost my chain without the 3rd Eye, I've always been able to shift it back on or put it back by hand without dismounting, so on balance it cost me big time last year.

This season, I'm thinking of leaving the triple crank that's currently on the bike (I like the 36/46 combo of the middle & big rings), and just block out the granny with the stops for races, using that twiddle ring as my "chain watcher."

Cheers!
Also check the Rohloff chainguide...GlowBoy
May 30, 2002 12:00 PM
Click on the "Chainguide" link on the left side of this page:

http://www.rohloff.de/english/products/index.htm

More technical info if you click on the "Download" page and scroll the page about halfway down to the "Mounting the Chainguide" link. NOT the "Mounting the Chainguide" link near the top of the page.

- Dan
dremel's.atpjunkie
May 30, 2002 4:10 PM
you'll burn the motor out using a Dremel, better off with a Fordham Flexible tool. But add up the amount of time it's going to take Jerry Rigging, assign a dollar per hour value to your time and frustration and see which is "CHEAPER"
use a derailleurclimbo
Jun 3, 2002 6:01 AM
I run Campy and leave my front der. on to keep the chain in place, it works great and I can trim the front if I need to from any chain rub. It doesn't happen that often so I usually just leave it. Good thing is I can swap out to 2 rings any time I want without having to put the whole shifter/der. combo back on each time.