Chain Guide, ala PVD

The need for a chain guide

By running a single front ring on my six speed MTB, I have to have a way of keeping the chain on the ring. Without a guide, the chain will fall off several times a ride.

Since I ride trails, I wanted a nice solid chain guide that didn't mount in a heavy way to a bash guard. Chainrings are the only bash guard a singletrack rider needs.

What's wrong with bash rings

Bash rings are great things for trials riders and downhill racers. For the rest of us, they are just heavy clutter on the bike.

Most people running bash rings have a fantasy as to how hard they ride. They are usually unscratched and never used.

Almost all singletrack trail riding will not need a bash ring, even with large obsticles.

The consumable parts

The Truvative Boxguide box is available as a spare part for about $20. It's a good idea to design around cheap and commonly available consumables.

This is the stock configuration of the part.





The parts included in the spares.

The custom clamp

The print for making the clamp and mount bracket. It's not a production drawing, so it's a little sloppy with some details left for other prints.


I machined a custom bracket to mount the box to my frame from the seat tube. Locating the proper position of the guide was the most difficult part, but a little math helped.



It's a super solid set-up.



139 grams. Not the lightest, but tougher than anything you can find.

Fitment on the bike

With the guide installed, the chain has no place to go but the right way. It is rock solid on the trails.





Pretty slick!