These days, there’s not just a part, but a system. Most things are comprised of more than one part, so the "system" tag makes sense. The MRP System 3 Party Crasher chain guide is an excellent case in point.

The MRP System 3 Party Crasher chain guide has five parts by our count. There’s a bash ring to prevent the chain derailing to the outside, and protect it from grinding rocks and logs on tough bottom outs or nasty terrain. There’s a machined aluminum boomerang holding three more pieces. On the upper part of the boomerang there’s both a sealed bearing roller and an inner plate to prevent the chain from derailing to the inside. It's made of super durable plastic that quiets chain noise when riding in the lowest gears in the rear -- a far cry from past iterations. And finally, on the lower part of the boomerang, there’s another sealed bearing roller to make the travel from the chainring to the rear derailleur smoother.

The system is overbuilt. It’s overbuilt because the rider MRP had in mind was the kind that can’t help themselves. Like the guy who fills up on chips, dip, and brews and wasn’t even invited. Nice enough guy, but you hope that when he hurls, it’s into a trash can or a toilet, or the unfriendly neighbor’s yard.

The MRP System 3 Party Crasher chain guide is designed to work with 36-40 tooth chain rings. The bash ring is a four-bolt mount compatible with 104mm bolt circle diameter cranks. The upper and lower guides are adjustable. There are three boomerang choices; ISCG, ISCG -05, or bottom bracket mount. 470g.