Search found 877 matches

by Grantmac
Sep 07 2021 9:25pm
Forum: EBike Non-hub Motor Drives
Topic: 'lightest.bike' 1.7kg 1000w mid drive
Replies: 129
Views: 16564

Re: 'lightest.bike' 1.7kg 1000w mid drive

Trials cranks are available in modern splines including some PF bottom brackets and a few people have made adapters to mount splined freewheels on DM cranks.
It's not rocket surgery.
by Grantmac
Sep 01 2021 2:58pm
Forum: Bike Mechanical & Structural
Topic: Left side drive: what's current?
Replies: 81
Views: 2675

Re: Left side drive: what's current?

Sounds like you just need to buy an LMX.
by Grantmac
Aug 30 2021 11:49am
Forum: EBike General Discussion
Topic: Specialized Stumpjumper conversion recommendations
Replies: 78
Views: 1998

Re: Specialized Stumpjumper conversion recommendations

Sur-rons ARE motorbikes. "Bicycles" with +1500w ARE motorbikes. Trail access is a very real issue that isn't helped by building motorbikes that can pass as bicycles. Around town I don't personally care, but at places set aside for MTBs I absolutely understand why there are lines in the san...
by Grantmac
Aug 13 2021 5:02pm
Forum: EBike Technical
Topic: What’s the weakest link in my electric bike?
Replies: 11
Views: 663

Re: What’s the weakest link in my electric bike?

On a ground up build with what you're trying to do I'd use an OSET hub and forget about the freehub. That'll let you run regen as well.
by Grantmac
Aug 10 2021 10:52pm
Forum: EBike Non-hub Motor Drives
Topic: 'lightest.bike' 1.7kg 1000w mid drive
Replies: 129
Views: 16564

Re: 'lightest.bike' 1.7kg 1000w mid drive

Honestly you can either pick between fast-ish production with the first units being not fully developed (CYC) or a much slower development with what are hopefully very refined systems (Lightest).
by Grantmac
Aug 10 2021 12:03am
Forum: EBike Troubleshooting
Topic: What are the problems with e-bikes?
Replies: 33
Views: 849

Re: What are the problems with e-bikes?

Anything that negatively impacts traction and is fiddly to setup isn't going to fly in the commercial realm. Personally I see the integration of gearboxes and motors in the frame as the big leap for EMTBs. Electric motors need lots of reduction but not lots of gears, humans can turn pretty high gear...
by Grantmac
Aug 09 2021 11:36am
Forum: EBike Non-hub Motor Drives
Topic: 'lightest.bike' 1.7kg 1000w mid drive
Replies: 129
Views: 16564

Re: 'lightest.bike' 1.7kg 1000w mid drive

The observed trials world offers a variety of much higher quality freewheeling cranks in a range of lengths and bottom bracket types.
by Grantmac
Aug 09 2021 11:25am
Forum: EBike Troubleshooting
Topic: What are the problems with e-bikes?
Replies: 33
Views: 849

Re: What are the problems with e-bikes?

I think EMTBs can get lighter through better battery tech and possibly some motor optimization. 40-45# has been done in the DIY world by keeping power low enough to be an assist rather than offering Olympic sprinter power on top of what the human produces.
by Grantmac
Aug 08 2021 10:59pm
Forum: EBike Troubleshooting
Topic: What are the problems with e-bikes?
Replies: 33
Views: 849

Re: What are the problems with e-bikes?

Heavy and expensive, even the very best factory EMTBs are just too damn heavy.
by Grantmac
Aug 08 2021 7:17pm
Forum: EBike General Discussion
Topic: Recumbent Trike as Legal Wheelchair?
Replies: 11
Views: 398

Re: Recumbant Trike as Legal Wheelchair?

I'm assuming this is to allow use in areas that prohibit ebikes? If so I'd want to be sure the person truly requires the accommodation.
by Grantmac
Aug 06 2021 4:13pm
Forum: E-Vehicles General Discussion
Topic: Why Shimano Di2 is the perfect complement to a BAC 855 and BBSHD setup
Replies: 53
Views: 2360

Re: Why Shimano Di2 is the perfect complement to a BAC 855 and BBSHD setup

Di2 is amazing for hand cyclists with limited hand movement or strength. Hopefully electric shifting becomes more mainstream and affordable for them.
by Grantmac
Jul 29 2021 10:31am
Forum: Electric Aircraft
Topic: 3D printed 400mm EDF project
Replies: 30
Views: 1799

Re: 3D printed 400mm EDF project

https://markforged.com/3d-printers/mark-two?utm_source=gads&utm_medium=cpc&utm_campaign=12003716395&utm_content=117251557578&utm_term=%2Bmarkforged%20%2Bmark%20%2Btwo%20%2Bprice&gclid=CjwKCAjwgISIBhBfEiwALE19SQcPfBFXS9USNRAe0pPjJwoxXuFqYS0cl3agrQmoVUSjdljrcRE6BxoClNQQAvD_BwE It'...
by Grantmac
Jul 28 2021 7:45pm
Forum: Electric Aircraft
Topic: 3D printed 400mm EDF project
Replies: 30
Views: 1799

Re: 3D printed 400mm EDF project

https://markforged.com/3d-printers/mark-two?utm_source=gads&utm_medium=cpc&utm_campaign=12003716395&utm_content=117251557578&utm_term=%2Bmarkforged%20%2Bmark%20%2Btwo%20%2Bprice&gclid=CjwKCAjwgISIBhBfEiwALE19SQcPfBFXS9USNRAe0pPjJwoxXuFqYS0cl3agrQmoVUSjdljrcRE6BxoClNQQAvD_BwE It's...
by Grantmac
Jul 28 2021 2:47pm
Forum: Electric Aircraft
Topic: 3D printed 400mm EDF project
Replies: 30
Views: 1799

Re: 3D printed 400mm EDF project

Continuous fiber filament printing I believe can produce parts with almost the strength of aluminum now. Prices are coming way down too.
by Grantmac
Jul 25 2021 8:56pm
Forum: EBike Build Threads
Topic: My attempt at a lightweight EMTB with torque based PAS
Replies: 103
Views: 8726

Re: My attempt at a lightweight EMTB with torque based PAS

Spinning the axle would allow quite a bit more weight reduction and mounting options.
by Grantmac
Jul 25 2021 8:36pm
Forum: EBike General Discussion
Topic: Is a full-on Downhill DIY ebike a mistake for XC Singletrack?
Replies: 11
Views: 389

Re: Is a full-on Downhill DIY ebike a mistake for XC Singletrack?

Specifically I want to build an Enduro 650b under 45lbs. If by "Enduro" you mean a bike that has a suitcase full of battery instead of a frame, then your weight goal is not feasible. It's barely feasible if you start with a proper bike. If you have what I would consider to be a very modes...
by Grantmac
Jul 25 2021 5:35pm
Forum: EBike General Discussion
Topic: Is a full-on Downhill DIY ebike a mistake for XC Singletrack?
Replies: 11
Views: 389

Re: Is a full-on Downhill DIY ebike a mistake for XC Singletrack?

Sure +2 two hours of EMTB does have certain fitness challenges so long as you are riding difficult terrain. But 30-60 minutes around home isn't going to do much when you're using a motor that simples adds way more power than you need. I ride a lot of classic West Coast single track and the iconic &q...
by Grantmac
Jul 25 2021 3:49pm
Forum: Motor Technology
Topic: DD Motor
Replies: 34
Views: 1054

Re: Interested in developing a DD hub motor

The problem with DD motors is weight and low end torque. Fix that and they become relevant.
by Grantmac
Jul 25 2021 3:16pm
Forum: EBike General Discussion
Topic: Is a full-on Downhill DIY ebike a mistake for XC Singletrack?
Replies: 11
Views: 389

Re: Is a full-on Downhill DIY ebike a mistake for XC Singletrack?

If it's fitness you're after leave the motor at home, especially a DIY setup which includes a throttle. If however you must add a motor then do something like this: https://endless-sphere.com/forums/viewtopic.php?f=6&t=107622 Which offers minimal weight and just enough assist to help without tak...
by Grantmac
Jul 24 2021 10:26am
Forum: EBike General Discussion
Topic: Specialized Stumpjumper conversion recommendations
Replies: 78
Views: 1998

Re: Specialized Stumpjumper conversion recommendations

I'm very PRO mid-drive and ANTI hub motor for off-road use actually. What I am against is loosing ground clearance and having a motor hit obstacles first. As was just posted the X1 is a mid-drive from CYC which has just started shipping. OK, glad I got to see that. That dual chain setup is totally ...
by Grantmac
Jul 23 2021 1:27pm
Forum: EBike General Discussion
Topic: Specialized Stumpjumper conversion recommendations
Replies: 78
Views: 1998

Re: Specialized Stumpjumper conversion recommendations

I'm very PRO mid-drive and ANTI hub motor for off-road use actually.

What I am against is loosing ground clearance and having a motor hit obstacles first.

As was just posted the X1 is a mid-drive from CYC which has just started shipping.
by Grantmac
Jul 23 2021 10:36am
Forum: EBike General Discussion
Topic: Specialized Stumpjumper conversion recommendations
Replies: 78
Views: 1998

Re: Specialized Stumpjumper conversion recommendations

Backpack battery is one option. Custom to fit the frame is another, especially if you keep the power and battery small.

Definitely don't do a rack mount battery and hub motor, you might as well ride one if the dinosaurs Chalo posted.
by Grantmac
Jul 22 2021 11:39pm
Forum: EScooters/EMotorcycles
Topic: Kollter usa Banshee Storm / Time ET gearbox emoto
Replies: 24
Views: 2456

Re: Kollter usa Banshee Storm / Time ET gearbox emoto

Where did you find the Nicot? They do look much better and apparently the brand has been around a while on the value end of the spectrum, probably much like Japanese bikes in the 70s.