Search found 331 matches

by Bullfrog
Oct 15 2020 3:02pm
Forum: Items for Sale - Used
Topic: 5T MAC Motor...less than 20 miles on it, $200 plus shipping
Replies: 0
Views: 290

5T MAC Motor...less than 20 miles on it, $200 plus shipping

Yes "5T"...I had this motor specially produced by MAC. I built a bike using the motor in a 26" wheel and did 48.6 mph with a 52v battery. It will be shipped in the original Styrofoam packaging that MAC shipped the motor to me in. This is just the motor...it will need to be laced to a ...
by Bullfrog
Oct 14 2020 2:54pm
Forum: E-Bike General Discussion
Topic: Landspeed Record Attempt
Replies: 147
Views: 11256

Re: Landspeed Record Attempt

Front is a 2.4x26 Schwalbe Super Moto-X and the rear is a 2.5x26 Maxxis Hookworm.

Motor is a "5T" I special ordered from MAC.
by Bullfrog
Oct 14 2020 1:32pm
Forum: E-Bike General Discussion
Topic: Landspeed Record Attempt
Replies: 147
Views: 11256

Re: Landspeed Record Attempt

The problem with Bonneville is the class structure is based on overall weight...sort of archaic IMO and developed back when the only batteries available were lead acid. The East Coast Timing Association currently follows the class structure developed by the National Electric Drag Racing Association...
by Bullfrog
Sep 30 2020 6:34am
Forum: E-Bike Build Threads / Photos & Video
Topic: Radwagon 72v GMAC Phaserunner Build
Replies: 83
Views: 8698

Re: Radwagon 72v GMAC Phaserunner Build

RSwannabe...what diameter rear tire are you running? Still running the Hookworm's, if yes how do you like them? I am running a 29x2.6" Maxxis Ikon right now and the large diameter makes my overall gearing a little too high for my conditions...which in turn contributes to overheating. Not terrib...
by Bullfrog
Sep 29 2020 8:33pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Radwagon 72v GMAC Phaserunner Build
Replies: 83
Views: 8698

Re: Radwagon 72v GMAC Phaserunner Build

The amperage limit is defined by what the battery can supply, the controller can transmit and the motor can handle without breaking if you are only going to do it for a short period of time. A MAC may be able to handle more than 60A at 58.8v for short periods of time, that is all my battery's BMS ca...
by Bullfrog
Sep 29 2020 6:02pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Radwagon 72v GMAC Phaserunner Build
Replies: 83
Views: 8698

Re: Radwagon 72v GMAC Phaserunner Build

Before you start your build....you can't run over about 1,200 watts continuously or the MAC will over heat. You can push 60A with 58.8v temporarily without any problems. The MAC does put out more thrust/torque than any motor available for an ebike assuming you feed them both the same battery amperag...
by Bullfrog
Sep 29 2020 4:02pm
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 51
Views: 5560

Re: EM3ev vs Luna Batteries and Kits

UPS just delivered my 14s6p battery from EM3ev...it is a replacement for a HG2 cell battery that never would fully charge. The new hard plastic case that surrounds the battery looks very nice and protective and it comes with a triangle bag with Velcro straps to attach everything to your bike. Anyone...
by Bullfrog
Sep 28 2020 7:09pm
Forum: E-Bike General Discussion
Topic: Why are geared motors worse than direct drive for climbing hills?
Replies: 58
Views: 3096

Re: Why are geared motors worse than direct drive for climbing hills?

Axle spin out or a broken axle...it depends on the combined stress...i.e. torque plus bending where the bending is a combination of the weight on the axle and the impact loading (hitting a bump or landing after a jump). A MAC running 52v/60A Battery/160A Phase puts out about the same torque as a QS2...
by Bullfrog
Sep 27 2020 6:15am
Forum: E-Bike General Discussion
Topic: Fat tires for class 3+ urban utility bikes?
Replies: 20
Views: 2026

Re: Fat tires for class 3+ urban utility bikes?

Based on my experience...if you are running all "bicycle" components i.e. frame, rims, tires, brakes, etc., about 30 mph is as fast as you can "safely" go without worrying about exceeding the capability of the components. Of course that assumes you are running "good" bi...
by Bullfrog
Sep 24 2020 7:06am
Forum: E-Bike Build Threads / Photos & Video
Topic: Radwagon 72v GMAC Phaserunner Build
Replies: 83
Views: 8698

Re: Radwagon 72v GMAC Phaserunner Build

The MAC/GMAC will produce more torque per amp than any ebike motor assuming you feed the same battery amperage. That is one of the big advantages of a geared hub motor. I have been running 160 phase amps (55A battery amperage limit) and no issues with the gears or clutch :wink: .
by Bullfrog
Sep 12 2020 3:46pm
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 51
Views: 5560

Re: EM3ev vs Luna Batteries and Kits

markz...you know Grin Tech is in Canada. Maybe Justin can help you :D . I have to give a huge THANK YOU to EM3ev and take back anything and everything negative I have ever implied or said about them. Bought a 14s5p battery with HG2 cells back in Nov '19 and it never would fully charge. They sent me ...
by Bullfrog
Sep 10 2020 10:47am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2103
Views: 412473

Re: Definitive Tests on the Heating and Cooling of Hub Motors

I would NOT change cooling fluids if what you are running is working but if you have your motor open switching to a Low Viscosity Full Synthetic ATF like Dexron VI or the "Super Tech" brand of Low Viscosity Full Synthetic that Walmart sells will do three things for you... A. It will go to...
by Bullfrog
Sep 06 2020 6:52am
Forum: E-Bike General Discussion
Topic: MAC motor selection and MAC clutch issues.
Replies: 20
Views: 1868

Re: MAC motor selection and MAC clutch issues.

The presence of water (or any electrolytic fluid) will wreak havoc on bearings in a motor. They already endure a tough life living inside a constantly changing magnetic field that turns them into tiny ion pumps. On large AC motors the armature bearings can literally weld themselves to the armature ...
by Bullfrog
Sep 06 2020 6:04am
Forum: E-Bike General Discussion
Topic: Fat tires for class 3+ urban utility bikes?
Replies: 20
Views: 2026

Re: Fat tires for class 3+ urban utility bikes?

It is not about what is "legal" it is about not having a tire failure when you are going around a corner and leaving a lot of your skin on the pavement...that is not a lot of "fun". I had a tire explode at 35 mph...luckily I was going in a straight line and could come to a stop w...
by Bullfrog
Aug 31 2020 11:38am
Forum: E-Bike General Discussion
Topic: MAC motor selection and MAC clutch issues.
Replies: 20
Views: 1868

Re: MAC motor selection and MAC clutch issues.

Triketech....that is a cool looking and well designed trike you have :thumb: .
by Bullfrog
Aug 31 2020 11:36am
Forum: E-Bike General Discussion
Topic: MAC motor selection and MAC clutch issues.
Replies: 20
Views: 1868

Re: MAC motor selection and MAC clutch issues.

About 1200 watts continuous is what the MAC can handle without overheating...unless you add some sort of auxiliary cooling. For short periods of time, I have run 60A battery and 160A phase with not problems whatsoever. I like Mobil SHC 100 for the planetary/ring gears....I put it on the ring gear ab...
by Bullfrog
Aug 31 2020 10:43am
Forum: E-Bike General Discussion
Topic: MAC motor selection and MAC clutch issues.
Replies: 20
Views: 1868

Re: MAC motor selection and MAC clutch issues.

Mighty Volt...will either one of the threads below help: https://endless-sphere.com/forums/viewtopic.php?t=51310 https://endless-sphere.com/forums/viewtopic.php?t=54422 Or you can buy the 5T MAC I have for sale and take it apart :lol: . If anybody else is interested in a 5T MAC new still in the box:...
by Bullfrog
Aug 24 2020 12:27pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Electric Schwinn Shuffle?
Replies: 23
Views: 4901

Re: Electric Schwinn Shuffle?

magneato wrote:
Aug 24 2020 12:03pm
I measure 4" :thumb:
Thank You...must use a standard 20" hub which is 100mm or as you measured 4" :wink: .

That means a MAC motor designed for the rear wheel (135mm) won't work but a MAC designed for the front would (100mm) :D .
by Bullfrog
Aug 24 2020 5:15am
Forum: Stand-up E-scooters and E-skateboards
Topic: Electric Schwinn Shuffle?
Replies: 23
Views: 4901

Re: Electric Schwinn Shuffle?

Can someone please tell me the width of the rear hub or the inside distance between the rear frame rails where rear wheel attaches for the Schwinn Shuffle?

Thinking about using a MAC motor but I want to make sure the frame is wide enough before I buy the motor.

Thank You
by Bullfrog
Aug 21 2020 6:12am
Forum: E-Bike Technical
Topic: Mxus 3k vs Qs205
Replies: 40
Views: 4179

Re: Mxus 3k vs Qs205

The Kv determines the rpm the motor wants to turn and is measured in rpms per volt. So a 12T MAC without any load will turn slower than a 10T MAC. With "T" being the number of times copper wire is wrapped around each pole of the stator...or proportional to the number of wraps in the case o...
by Bullfrog
Aug 20 2020 8:57pm
Forum: E-Bike Technical
Topic: Mxus 3k vs Qs205
Replies: 40
Views: 4179

Re: Mxus 3k vs Qs205

The 5T I had custom made because I was going to attempt to set a speed record but it is still in the box and I never used it. I had planned to install it in a 29" wheel and only run it for a few minutes at a time. If somebody wanted to use it in a 20" wheel, it would work great but I would...
by Bullfrog
Aug 10 2020 7:21pm
Forum: E-Bike Technical
Topic: Mxus 3k vs Qs205
Replies: 40
Views: 4179

Re: Mxus 3k vs Qs205

Bullfrog, have you already purchased an motor? Yes...I just received my MAC motor today 10 Aug 2020. I had a 5T MAC custom wound for high speed by MAC BUT I had a little motorcycle accident that is going to keep me off of two wheels for a while. I have the 5T Freewheel MAC listed in the marketplace...
by Bullfrog
Aug 03 2020 8:46am
Forum: E-Bike Technical
Topic: Mxus 3k vs Qs205
Replies: 40
Views: 4179

Re: Mxus 3k vs Qs205

Grin tech has a youtube video where Justin talks about using two wheel drive...IMO I would not mix motor type, you'll end up with one doing all the work.
by Bullfrog
Jul 31 2020 6:33pm
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 51
Views: 5560

Re: EM3ev vs Luna Batteries and Kits

If you have a way to charge the pack at a current that is less than the balancing shunt current (typically 50mA or so), you could let it go for a long time and it should eventually bring up the low cell groups. If you can access the cell connections at the BMS, it would be faster to manually charge...