BXT SL-115

[moimoi]

First picture is the Cring, you need it
Second picture is the race crown, goes between your fork and the lower headset bearing.

So that part is actually necessary. I’ll reach out to the seller and ask about it.

[moimoi]

I didn’t realize it at first because the color was different from the seller’s picture, but it looks like this is the C-ring. It was included after all.
Thank you both!

[Ludo]

yep, that's the one, you're good to go!

[moimoi]

I’ve finished building my SL-115! I reused the main drivetrain from my previous rim-brake road bike, and it turned out great!

[Stubbie Blue]

I converted this bike to an e-bike with a TruckRun RN04 250W thru-axle hub motor. It can get up to 28 mph on the highest level 5 assist (there is no throttle). On level 3 it can comfortably cruise at 22 mph with 160W of pedaling power. I haven't run through a full charge yet so I don't know the range but I'm guessing ~30 miles with the 36V 10.5Ah battery.

[Stubbie Blue]

Went for a ride along A1A in South Florida. Did 32 miles at avg 23 mph and had 25% left on the battery so range should be about 40 miles. The motor has a torque sensor so it boosts your pedaling force and you feel like you've instantly become a pro cyclist. Actually I converted another bike with a ToSeven DM02 500W mid-drive motor and I took it on a fast group ride in Miami:

[Danebiker]

How are you liking the truckrun motor compared to the toseven middrive? I have a hardtail with a 52v BSHD system on it but I am tired of switching cassettes and chains. I also want a bike that feels better to pedal. I have considered buying a gravel bike and mounting a truckrun RN04, but it is really hard to find information/reviews of it.

Does the torque sensing feel natural?
How does it feel to ride without a battery?

[Stubbie Blue]

How are you liking the truckrun motor compared to the toseven middrive? I have a hardtail with a 52v BSHD system on it but I am tired of switching cassettes and chains. I also want a bike that feels better to pedal. I have considered buying a gravel bike and mounting a truckrun RN04, but it is really hard to find information/reviews of it.

Does the torque sensing feel natural?
How does it feel to ride without a battery?

TruckRun RN04 hub motor
Pros:
- Fits most thru-axle bikes.
- Can keep front derailleur and crankset, Q-factor.
- Torque sensor works okay. No 'ghost pedaling'. But I think the assist levels are based on speed limits where the motor cuts out, e.g. Lvl 1=25km/h, 2=30km/h, 3=35km/h, 4=40km/h, 5=45km/h, so they don't actually change the ratio of assist to your pedaling force.

Cons:
- Only 250W. Can only reach around 28 mph with a fair amount of pedaling power.
- A lot of drag without motor assist.
- I put on a 36V 10.5Ah battery so range is only 30-40 miles.
- You need to build the hub into a wheel rim.
- Has a Shimano HG 11/12 speed road freehub, so no SRAM XD/XDR or Micro Spline.

ToSeven DM02 500W mid-drive motor
Pros:
- Fairly powerful, and utilizes rear gearing. Can reach 28+ mph.
- I put on a 48V 20Ah battery so range is 70+ miles.
- The torque sensing works a bit better. You can change the ratio of assist.

Cons:
- Can only install on aluminum or steel bikes with a 'full tube' BSA bottom bracket shell and narrow chainstays for clearance from the motor gear.
- Q factor very wide at ~200mm plus I had to use a 16mm pedal extender on the left to even them out.
- Need to use special 1x chainrings made for the motor.

Overall I like the TruckRun RN04 better. You can put it on nicer bikes like a carbon road bike, and can keep your drivetrain and crankset with the same Q-factor. It also looks a bit more discrete than the ToSeven DM02 mid-drive. Actually I upgraded this bike with a carbon crankset and wheels to bring the weight down to 12.6 kg/27.8 lb with battery & motor.

[fenomeno]

TruckRun RN04 hub motor
Pros:
- Fits most thru-axle bikes.
- Can keep front derailleur and crankset, Q-factor.
- Torque sensor works okay. No 'ghost pedaling'. But I think the assist levels are based on speed limits where the motor cuts out, e.g. Lvl 1=25km/h, 2=30km/h, 3=35km/h, 4=40km/h, 5=45km/h, so they don't actually change the ratio of assist to your pedaling force.

Cons:
- Only 250W. Can only reach around 28 mph with a fair amount of pedaling power.
- A lot of drag without motor assist.
- I put on a 36V 10.5Ah battery so range is only 30-40 miles.
- You need to build the hub into a wheel rim.
- Has a Shimano HG 11/12 speed road freehub, so no SRAM XD/XDR or Micro Spline.

ToSeven DM02 500W mid-drive motor
Pros:
- Fairly powerful, and utilizes rear gearing. Can reach 28+ mph.
- I put on a 48V 20Ah battery so range is 70+ miles.
- The torque sensing works a bit better. You can change the ratio of assist.

Cons:
- Can only install on aluminum or steel bikes with a 'full tube' BSA bottom bracket shell and narrow chainstays for clearance from the motor gear.
- Q factor very wide at ~200mm plus I had to use a 16mm pedal extender on the left to even them out.
- Need to use special 1x chainrings made for the motor.

Overall I like the TruckRun RN04 better. You can put it on nicer bikes like a carbon road bike, and can keep your drivetrain and crankset with the same Q-factor. It also looks a bit more discrete than the ToSeven DM02 mid-drive. Actually I upgraded this bike with a carbon crankset and wheels to bring the weight down to 12.6 kg/27.8 lb with battery & motor.

Hi
You said that the motor drag is high. Is this true?
Thanks