Crazy Mountain Motorsports started building sleds in 1991 because they knew they could build a better snowmobile for back country mountain riding than what the major manufacturers were producing. High-quality, high performance, light weight, efficiency and reliability were, and still are, the goals for building Crazy Mountain Xtreme (CMX) products.
The team at CMX is very excited about their latest Crazy Mountain Xtreme Bike Kit. They are applying the same fundamental practices building these kits as they did building CMX snowmobiles. They never look for the cheapest parts to build their products – they look for the best parts. They build products the way that they would want them for their own use, because they don’t just build them, they ride them too and they want the best!
They are also applying the same technology that they have learned in their 25 plus years of experience building CMX snowmobiles to the CMX Bike Kit. Just like their CMX snowmobiles, they are building the CMX Bike Kit for back country mountain riding.
The chassis assembly of the CMX is built from CNC machined aluminum parts. This design and manufacturing procedure lends itself to a very high level of precision. Their R&D team learned that mounting the track system as far forward as possible is a huge advantage. By having the chassis mounted further forward, it puts the rider weight in a better position, which greatly improves handling. Their bike adapter is made of 1-1/4” thick billet aluminum. The adapter mounts to the motorcycle, and the CMX chassis mounts to the bike adapter. This allows for multiple mounting positions. Different bikes with different style of rear suspensions will dictate how far forward the kit can be mounted and still maintain clearance between the track and the frame. The CMX was designed to have a compliant link rod (not rigid mounted to the bike). By using a polyurethane bushing in the end of the link rod, it allows for movement between the CMX chassis and the bike. The link rod is aluminum tube and has left hand threads on one end and right hand on the other, so it can be adjusted without removing it.
The new design CMX rails (built by IceAge) are lighter and stronger. They also lengthened and redesigned the front of the rail for the 2018 season to create an even better attack angle. This, combined with correct rear suspension geometry, provide a very shallow attack angle which will improve the ability to get up on the snow. This geometry also maintains perfect track tension as it goes through its travel. Their rear suspension with a scissor-style rear torque arm will soak up the bumps as well as provide transition to lift the front-end for a very light feeling, playful riding style. ZBROZ coil-over shocks are standard equipment. The crew at ZBROZ rides CMX Snowbikes in the mountains and they constantly strive to improve suspension performance.
The CMX track has a 2-1/2” tall center lug with a 2 1/4” outer lug, and is 12-1/2” wide. This design makes for great trail manners as well as making it a great deep-snow track. CMX has 3 track lengths available; 120”, 129” & 137”. This season they will be building an 11” wide kit. This narrower kit will be best suited for Snowbike racing and smaller riders. The standard 12 1/2” wide track will be better for steep and deep backcountry riding where floatation is the priority.
CMX built the first belt drive system to be used on a production built snowmobile in 1999, and they also offered it in kit form for all brands of snowmobiles. They realized the performance benefits of a belt drive system over a chain drive system with the very first one they built. The belt drive system on the CMX Bike Kit is the best one they have built to date, starting with a clean sheet of paper. The 1/2” thick CNC’d aluminum plate that bolts to the side of the chassis not only houses the belt drive system, it also adds rigidity to the chassis. They chose to run a right side drive for the secondary drive to create a more balanced system. The hubs on the jackshaft that the bearings ride on are 9.3” from bearing to bearing – this balances the load to the track that starts at the countershaft sprocket on the bike. It also puts less torsional load on the chassis and bearings because it carries the load on bearings that are 9.3” apart. The aluminum trackshaft has a 1-1/16” hex. The jackshaft and the trackshaft are one-piece units made from 7075 T6 billet aluminum. This means the hubs (that the sprockets and brake disc mount to) are part of the shaft. Because the sprockets and brake disc bolt directly to hubs, this design eliminates the need for splines. This also eliminates the problem of wear that takes place between sprockets and shafts with splines. In CMX’s experience, the belt drive is not only more efficient in transferring power to the track, it is just as durable as a chain on big drops and jumps.
The entire team (engineering, machine, fabrication, welding, assembly and test pilots) at CMX put a lot of thought into the design of the CMX and are very proud of what they have to offer. They are confident when you get to try it, you will like it too!
Pricing for the 2016/2017 season for CMXBK is as follows:
* 120”- $6,995.00
* 129”- $7,295.00
* 137”- $7,795.00
Contact Crazy Mountain Motorsports at 406-686-4921 or visit them on the web at