Search found 829 matches

by Grantmac
May 09 2021 10:16am
Forum: EBike Non-hub Motor Drives
Topic: Nm Torque Comparison to BBSHD
Replies: 11
Views: 303

Re: Nm Torque Comparison to BBSHD

I'm actually really looking forward to factory ebikes with bricked controllers/bms/etc becoming available for cheap but even though I live in a MTB hotbed it's just not happening. I may eventually just buy a 3-4 year old EMTB to compliment my "acoustic" bike even though my original intent ...
by Grantmac
May 08 2021 5:20pm
Forum: EBike Non-hub Motor Drives
Topic: Nm Torque Comparison to BBSHD
Replies: 11
Views: 303

Re: Nm Torque Comparison to BBSHD

Having a the capability to gain momentum without pedaling is the biggest difference between motorcycling and mountain biking. I say that as someone who has done a lot of the former but only recently gotten heavily into the latter. That difference really impacts trail design and difficulty which also...
by Grantmac
May 08 2021 9:39am
Forum: EBike Non-hub Motor Drives
Topic: Nm Torque Comparison to BBSHD
Replies: 11
Views: 303

Re: Nm Torque Comparison to BBSHD

Modern wheel sizes run smaller chainrings so the torque is only reduced at the wheel on the higher side of the cassette. I spend most of my day on my non-ebike 29er in 1:1 or higher reduction part of the cassette. I disagree with looking at raw numbers, look first at weight then at how the motor and...
by Grantmac
May 07 2021 8:40pm
Forum: EBike Non-hub Motor Drives
Topic: Nm Torque Comparison to BBSHD
Replies: 11
Views: 303

Re: Nm Torque Comparison to BBSHD

The thing is that a BBSHD will never be as well integrated with the bike which counts for a lot more than the raw power numbers.
Also most "250w" EMTBs peak around 1000w every pedal stroke.
by Grantmac
May 02 2021 10:25am
Forum: EBike Non-hub Motor Drives
Topic: 3DE - 3D Printed Carbon Wrapped e-bike frame
Replies: 36
Views: 1262

Re: 3DE - 3D Printed Carbon Wrapped e-bike frame

I'm anxiously waiting for continuous carbon filament printing capabilities to come to DIY priced printers. They are currently able to produce parts with greater strength to weight than aluminum, but start at I believe $5k minimum. Certainly in my lifespan I can foresee printing an entire bicycle fra...
by Grantmac
May 01 2021 12:09pm
Forum: EBike Non-hub Motor Drives
Topic: 3DE - 3D Printed Carbon Wrapped e-bike frame
Replies: 36
Views: 1262

Re: 3DE - 3D Printed Carbon Wrapped e-bike frame

Molds for the intersections and inflatable sections for the connecting areas. Ok I get it, but I have no idea how to make an inflatable mold :lol: Sections of inner tubes or similar. HOWEVER on second thought I think it would be easier to just use off the shelf rectangular carbon tubes and then do ...
by Grantmac
Apr 30 2021 10:24pm
Forum: EBike Non-hub Motor Drives
Topic: Best Mid-drive Motors in 2021
Replies: 12
Views: 1056

Re: Best Mid-drive Motors in 2021

CYC X1 Pro has a torque-sensing and has more power then a bafang. It doesn't seem to have a gear box. Wonder how it would fare uphill. Also I notice a chain drive, these kinds are noisy and chain derailing can happen as well. I had a similar setup in the past it was very painful. And serious off-ro...
by Grantmac
Apr 30 2021 10:14pm
Forum: EBike Non-hub Motor Drives
Topic: 3DE - 3D Printed Carbon Wrapped e-bike frame
Replies: 36
Views: 1262

Re: 3DE - 3D Printed Carbon Wrapped e-bike frame

Molds for the intersections and inflatable sections for the connecting areas.
by Grantmac
Apr 29 2021 11:55pm
Forum: EBike Non-hub Motor Drives
Topic: 3DE - 3D Printed Carbon Wrapped e-bike frame
Replies: 36
Views: 1262

Re: 3DE - 3D Printed Carbon Wrapped e-bike frame

You could do inflatable molds for the straight sections and save a bunch of print time.
by Grantmac
Apr 26 2021 11:16am
Forum: EBike Non-hub Motor Drives
Topic: BBSHD 29er or 26 or 27.5 FS Mountain / Off Road Opinions Needed
Replies: 20
Views: 868

Re: BBSHD 29er or 26 or 27.5 FS Mountain / Off Road Opinions Needed

There are better add on drives than the BBSHD coming available which might be worth waiting for. Specifically X1 Stealth and Lightest. Both of which could be mounted inside the correctly chosen frame and offer maximum ground clearance.
by Grantmac
Apr 22 2021 10:39am
Forum: EBike General Discussion
Topic: Putting together a starter e-handcycle, know nothing about bikes
Replies: 16
Views: 496

Re: Putting together a starter e-handcycle, know nothing about bikes

I'd look for a Sport-on XCR instead, possibly used now that many people who want to do more hardcore off-road are buying Jeet-trikes (which I think are more bike than you need).
by Grantmac
Apr 21 2021 10:12am
Forum: EBike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 717
Views: 101038

Re: GNG / CYC X1 Pro 3000w

You could remove the motor sprag clutch and lock it/replace with a normal bushing. YES you'd be spinning the motor when you pedal but my experience with a much bigger motor is that it's not a huge deal and if you lose all power you just remove the motor chain. In return you get much better response ...
by Grantmac
Apr 21 2021 10:08am
Forum: EBike Non-hub Motor Drives
Topic: Mid Drives Working With Coaster Brakes
Replies: 24
Views: 513

Re: Mid Drives Working With Coaster Brakes

This seems like a bike that would do well with a small geared front hub motor instead.
by Grantmac
Apr 20 2021 10:50pm
Forum: EBike Non-hub Motor Drives
Topic: 删除
Replies: 8
Views: 431

Re: RC6374中间电机

Interesting design, please don't use square taper cranks though.
by Grantmac
Apr 18 2021 3:38pm
Forum: EBike General Discussion
Topic: Looking to build an eBike
Replies: 12
Views: 452

Re: Looking to build an eBike

5mi commute and looking to improve fitness, what you want is a bicycle (not an ebike). And definitely not a lightweight electric motorcycle with pedals.
by Grantmac
Apr 14 2021 9:29pm
Forum: EBike Non-hub Motor Drives
Topic: Revonte ONE drive system
Replies: 9
Views: 1146

Re: Revonte ONE drive system

I'm curious about the weight, although it would be unsprung.
Q-factor also looks pretty wide.
by Grantmac
Apr 10 2021 9:32pm
Forum: EScooters/EMotorcycles
Topic: Banshee Storm by Kollter USA gearbox emoto
Replies: 5
Views: 366

Re: Banshee Storm by Kollter USA gearbox emoto

If only the rear suspension had a decent design, that one wasn't good in 1985.
by Grantmac
Apr 08 2021 10:30am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 113
Views: 9800

Re: Observed trials bike designing

I've said time and again that what a lightweight Emoto needs is a 2-speed, preferably a deep reduction and a direct gear.
I think a clutch and flywheel would be an asset however.

How does the bicycle sourced air suspension hold up?
by Grantmac
Apr 07 2021 11:23am
Forum: Electric Watercraft
Topic: Electric outboard 6kw Flipsky 65161
Replies: 4
Views: 476

Re: Electric outboard 6kw Flipsky 65161

If you can print them look at a higher aspect propeller using swept blades.
by Grantmac
Apr 05 2021 3:07pm
Forum: Bike Mechanical & Structural
Topic: Dirt Jump Bikes for Speed? Frame geometry questions?
Replies: 9
Views: 665

Re: Dirt Jump Bikes for Speed? Frame geometry questions?

I wouldn't build anything fast without rear suspension, especially with a mid-drive.
by Grantmac
Mar 28 2021 11:00am
Forum: EBike Non-hub Motor Drives
Topic: Which Grease for CYC X1 Pro gen 2 Planetary gearbox?
Replies: 8
Views: 435

Re: Which Grease for CYC X1 Pro gen 2 Planetary gearbox?

12-C wrote:
Mar 28 2021 12:53am
How has this gearbox held up over time?

I'm looking to mate one to a astro 3220...
Out of curiosity why not just use the CYC motor?
by Grantmac
Mar 27 2021 10:28am
Forum: E-Vehicles General Discussion
Topic: Motorsport, Racing, The Future
Replies: 88
Views: 2537

Re: Motorsport, Racing, The Future

If electrathon was available where I am I'd definitely be interested in it, hits all the criteria. Although I'd probably have to cut down some bodyweight :mrgreen:

120# is pretty darn light for something with full rollover protection.
by Grantmac
Mar 25 2021 11:11am
Forum: EBike Technical
Topic: A low-cost e-MTB Production log
Replies: 88
Views: 8963

Re: A low-cost e-MTB Production log

Wish these companies would hire someone who can design suspension rather than focusing on advertising. That linkage-less rear hasn't been a good idea since the 80s.
by Grantmac
Mar 25 2021 12:10am
Forum: EBike Technical
Topic: Novel gear reduction strategies
Replies: 6
Views: 359

Re: Novel gear reduction strategies

Oh I wouldn't try to actually USE a 3D printed version, besides I have a machine shop. If I could do 4 planets with two chains then the whole thing could be thinner. Offset holes in the planets should be easy to do. Their white paper says that durability is best if the bearings are in the carriers r...