ok whats the best way to do this running truvativ rouleur cranks on a porad with a 9 speed wheel? everything I've tried looks like poo...

oh yeah the bcd is 110

For my single ring bike I just took an old derailleur and spread it out a bit more with some pliers for the lowest and highest gears. Then drop the thing right over the whole of the chain and chainring. I never ever lost a chain. I also didnt really care about the look but I guess it just looks like you have a normal double set up untill upon further inspection it's a single.

I did this on my bike a few years ago. I substituted a Spot chainring guide for the outside chainring, then I used a Third-Eye Chainwatcher on the inside. I shortened the chain to reduce the likelihood of derailing. It ended up looking pretty good. With the chainguides on each side, you can take off the front derailleur. I've never lost a chain with this set-up.

3rd eye chain watcher and a ring guard?

http://www.store.yahoo.com/cyclocrossworld/chainrings.html

3rd eye chain watcher and a ring guard?

http://www.store.yahoo.com/cyclocrossworld/chainrings.html

Ring guard on the outside, chainwatcher on the inside. You should have both, just as your link suggests. Remember to shorten the chain.

I think Redline makes a device similar to the Third Eye, and I believe it's only $5 or $6. That Cyclocross World Wetzikon chainguard looks similar to my Spot.

Chainguards get pretty pricey. I am runnin a 42T chainwheel on the center and found a cool looking drilled 46T ring from Cambria on E-Bay, ground off the teeth and have my homemade chainguard for $10.
Also run the 3rd eye watcher, seems to work well so far.

I hate to say it but the 3rd eye is the worst device I've ever used on my cross bike. If the chain comes off during a hard forcefull effort then you will jam the chain below the dog tooth of the 3rd eyewatcher and then it's game over. You will need a tool to unscrew the 3rd eyes hose clamp to get the chain back on. This has happened to me on two ocassions and the 3rd eye went straight into the trash. IMHO for those who have not seen this happen yet, you will. If you are going to race go with ring guards (ground off teeth works good) or a low riding derailleur.

http://www.dirtyparts.ca/jack.html
Or sandwich the ring both sides with a plate\gaurd.

3rd eye chain watcher and a ring guard?

http://www.store.yahoo.com/cyclocrossworld/chainrings.html

http://img.photobucket.com/albums/v482/Lectron/Nettbilder/th_SCX1.jpg (http://img.photobucket.com/albums/v482/Lectron/Nettbilder/SCX1.jpg) http://img.photobucket.com/albums/v482/Lectron/Nettbilder/th_CXcrank.jpg (http://img.photobucket.com/albums/v482/Lectron/Nettbilder/CXcrank.jpg)

Works very well, but I haeven't seen a 42T 110BCD ring guard. Should be a pretty easy thing to make though.

If you have deep pockets, take a look into the T.A. Tevano Cyclocross Crankset. It's a beauty and a bargain at only $299.95:


http://sheldonbrown.com/harris/french-cranks.html#bottom

Scroll about halfway down the page.

I hate to say it but the 3rd eye is the worst device I've ever used on my cross bike. If the chain comes off during a hard forcefull effort then you will jam the chain below the dog tooth of the 3rd eyewatcher and then it's game over. You will need a tool to unscrew the 3rd eyes hose clamp to get the chain back on. This has happened to me on two ocassions and the 3rd eye went straight into the trash. IMHO for those who have not seen this happen yet, you will. If you are going to race go with ring guards (ground off teeth works good) or a low riding derailleur.

I must say that I have had the same experiences with mine. Perhaps someone could explain to us how properly to set up our plastic bits?

I agree that the Third Eye is a bit of a disappointment, even though I paid $1 for mine at a swap meet. Of course, a better (and more expensive) solution is a chainguard on each side of the chainring. To be fair, I've had some gnarly crashes during races, and even then I did not lose a chain. I was running a short-cage Dura Ace rear derailleur, which has really good spring tension, plus I shortened the chain as much as possible. I suspect these two elements helped to keep the chain from derailing. The trick with the Third Eye is to locate it close enough to the chainring so that the chain cannot drop below it. The elevation of the Third Eye needs to be such that in the event of a chain derailment the chain will slide down the sloped surface and back onto the ring. This takes a bit of trial and error to get right. But honestly, I have not had a single problem with it.

I tried this same set up on my mountain bike and it was a complete disaster. I attribute this to excessive chain slack due to the longer chain that's required for the long-cage derailleur and the higher gear range of the cassette.

the third eye should be called the stinky brown eye it's such a p.o.s.
the better one is the Deda dog fang.

scuse my ignorance... why not just use a front derailleur and no cable? At least it should work on the inner ring, right?

scuse my ignorance... why not just use a front derailleur and no cable? At least it should work on the inner ring, right?

The front derailleur does not prevent chain derailment like the chainguards do. You would still need to operate the derailleur to guide the chain back on the chainring.