Specialized SX Trail With Cyclone

This is the final iteration on this bike. The current setup runs 1500W continuous through a phaserunner into a cyclone. The drive train is single speed with very strong acceleration up to a top speed of 55 km/h. Its perfect for high speed and technical single track trails and i usually get around 35km per charge.

I designed and built all of the mounting and some of the drive line components. The mounts are a composite of 7075 aircraft aluminum and 30% carbon fiber reinforced nylon with elastomeric rubber between the frame and printed components to prevent vibration transfer from the motor to the frame.

Very nice. No attachment to the BB at all?

I tried that it, didn't work that well the motor torque would twist it out of alignment i have two aluminum plates that loop around the bottom bracket.

Do you no longer need the chain tensioner? Don’t think it’s under the cover. I think it’s been eliminated and you tighten the chain by moving the motor and mount up the down tube, good idea. Is that a motor bash guard in the cad render? It’s not in the bike photos.

Edit
I do see it’s fixed to the bottom brackets as you mention

I have a mounting point for a spring loaded chain tensioner under the cover but i don't really need it so i removed it. I sized the distance so a half link chain fits well with the right amount of slack and i use a narrow wide chainring along with a a little bit of throttle at rest to preload the driveline. the cover also has internal paths that help maintain the chainline. I haven't put alot of time on this iteration of the drive line to see if chain stretch is going to be an issue, but if it is i can bolt on the chain tensioner in 5 min.

Haven't made the bash guard yet waiting on some material something called pctpe has really good impact resistance.