Search found 92 matches

by Bullfrog
Sep 27 2019 12:34pm
Forum: E-Bike General Discussion
Topic: Lower back pain and bikes
Replies: 66
Views: 2689

Re: Lower back pain and bikes

Three options that help me a lot.... A. I stand up a lot and let my legs take the shock loading over bumps. B. I use a suspension seat post. The Diamondback is my preferred option but there are a lot of options out there. I like the DB because the movement is straight up and down as opposed to for a...
by Bullfrog
Sep 27 2019 12:19pm
Forum: E-Bike General Discussion
Topic: Need Alternative to Sram Dual Drive 3
Replies: 17
Views: 1125

Re: Need Alternative to Sram Dual Drive 3

Chalo...hope you are doing well.

Sure do miss your input on my crazy projects :wink: .
by Bullfrog
Sep 27 2019 12:15pm
Forum: E-Bike General Discussion
Topic: Need Alternative to Sram Dual Drive 3
Replies: 17
Views: 1125

Re: Need Alternative to Sram Dual Drive 3

o00scorpion00o...several options listed below: A. Luna sells the SRAM DD3 assembly, you could buy another one. BUT SRAM and everybody except Sturmey Archer have discontinued production of the 3 speed internally geared hubs so parts availability is going to become more and more difficult...except for...
by Bullfrog
Sep 27 2019 7:49am
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 50
Views: 4147

Re: G360 vs eZee, MAC

OK so back on the subject of this thread :lol: , I just love the graph with the MAC and the G360...I can very easily understand data when it is presented in such a fashion as opposed to just words. You can visualize the rates of change (derivative) sooo much easier...at least I can. Just for giggles...
by Bullfrog
Sep 26 2019 7:11pm
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 50
Views: 4147

Re: 2019 Motor Simulator, Mid-drives and other updates

Load carrying capacity is for the tire only and has nothing to do with the rim. Puncture protection is for puncture protection only and has nothing to do with Load Carrying Capacity. If you want to define "strength" as puncture protection...the Green Guard is stronger :D . As far as how long they wi...
by Bullfrog
Sep 26 2019 12:12pm
Forum: E-Bike Technical
Topic: MAC on 72 Volts
Replies: 0
Views: 94

MAC on 72 Volts

I feel the need...the need for speed. Yea that movie was a long time ago so you kids out there may not understand :lol: . I was a kid about 100 years ago so no problem. Anybody tried the current iteration of the MAC motor on 72 volts? Regardless...I plan to give it a shot. Unrelated to the 72 volts,...
by Bullfrog
Sep 25 2019 8:01am
Forum: E-Bike General Discussion
Topic: Best donor frame to build an electric bike & getting started
Replies: 44
Views: 7666

Re: Best donor frame to build an electric bike & getting started

Just a little more info to support disc brakes...and this is not my opinion but from someone who selected rim brakes. He does say that rim brakes can be lighter and a little simple if you have to disassemble your bike to travel for example but otherwise disc are the way to go. https://www.youtube.co...
by Bullfrog
Sep 19 2019 4:24pm
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 50
Views: 4147

Re: 2019 Motor Simulator, Mid-drives and other updates

The 27.5x2.8 has the highest load carrying capacity of any of the Super Moto-X tires...not sure exactly what you mean by "strong'.

The smaller you go with the diameter the smaller the footprint is for a given width...so I tend to stay away from 20" tires but I could use a 24x3.00 Super Moto-X :D .
by Bullfrog
Sep 17 2019 10:21am
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 50
Views: 4147

Re: 2019 Motor Simulator, Mid-drives and other updates

I've got other priorities now but I'm tempted to experiment to see what lightweight cooling mods and bolt on heatsink fins could be done to a BBS02 in order to make it meet or even exceed the thermal characteristics of a BBSHD. I struggle to grasp even 50% of the data, however I got quite excited t...
by Bullfrog
Sep 17 2019 10:09am
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 50
Views: 4147

Re: 2019 Motor Simulator, Mid-drives and other updates

Just a little scoop on what/why I am doing with water cooling the MAC... All good concerns above :D . My temps don't get anywhere close to boiling...max temp I have seen so far is 59C and that was when the ambient temp was 95F/35C. My test loop has a combination of hills and flat and before adding t...
by Bullfrog
Sep 12 2019 4:30pm
Forum: E-Bike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 50
Views: 4147

Re: 2019 Motor Simulator, Mid-drives and other updates

Justin...just came across this thread. Absolutely awesome...as usual, THANK YOU for adding the mid drive option. I have been playing with the Motor Simulator using the BBSHD motor a lot. It is great to be able to do a direct comparison of the BBSHD and the MAC/GMAC. Pretty amazing how much cooler th...
by Bullfrog
Aug 09 2019 6:13pm
Forum: E-Bike Non-hub Motor Drives
Topic: Largest single speed freewheel / cassette?
Replies: 6
Views: 1730

Re: Largest single speed freewheel / cassette?

Yes I know this is an old thread, just wanted to post some info so others could find it. I took a DNP freewheel, took it apart and it has the spline pattern of Shimano cassette gears. You can put it back together using whatever size cassette gears you like and space them according to desired shift p...
by Bullfrog
Jul 07 2019 10:02am
Forum: E-Bike General Discussion
Topic: Mongoose Dolomite Fat Bike 72V 3kW Options
Replies: 2
Views: 640

Re: Mongoose Dolomite Fat Bike 72V 3kW Options

JC, IMO you are going to run into several issues if you use a motor designed for 170mm dropouts on a Mongoose Fat Bike...all of which have 190mm dropouts according to Pacific Cycles who makes all of them. Besides bending the rear triangle you will have problems getting the brake disc mounted correct...
by Bullfrog
Jul 03 2019 12:41pm
Forum: E-Bike General Discussion
Topic: Are footpegs superior if you don't pedal?
Replies: 28
Views: 2819

Re: Are footpegs superior if you don't pedal?

I also considered going to footpegs being an old MX racer :lol: . But where I ride a motorized vehicle isn't legal. A bicycle with a motor is legal...well up to a point so I use 75mm crank arms that I bought from Unicycle.com. I can actually ride faster with the short crank arms than with footpegs b...
by Bullfrog
Jun 11 2019 11:00am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 4121
Views: 331236

Re: Sur-Ron - New Mid drive Bike

Need a little help please...can anyone tell me how many teeth are on the front and rear of the belt drive and how many teeth are on the front of the chain drive side? I want to calculate the overall reduction for various rear sprockets and need the tooth count for the other sprockets to do so. Why.....
by Bullfrog
Apr 26 2019 7:47am
Forum: E-Bike Technical
Topic: 12T MAC motor and high current
Replies: 28
Views: 4722

Re: 12T MAC motor and high current

Yes, I know this is an old thread but wanted to add a little info in case anybody comes across it. I have a 12T MAC and have laced it to everything from a 20" rim to a 27.5/650B rim...if I use it off road, it overheats. It is because I am not spinning the motor fast enough to keep it in the efficien...
by Bullfrog
Apr 16 2019 7:55pm
Forum: E-Bike General Discussion
Topic: Stealth Rims & tyres
Replies: 4
Views: 662

Re: Stealth Rims & tyres

Need a little help on 24x3.00 tires...does anybody have an actual outside diameter or circumference for any of the tires mentioned? I saw the Duro Razorback on the Duro website...do they make the Halo Contra for Halo? Tread pattern appears to be a little different. Which 24x3.00 tire will last the b...
by Bullfrog
Sep 08 2018 7:04am
Forum: E-Bike General Discussion
Topic: Kelly vs Sabvoton Controller review 2017
Replies: 44
Views: 9005

Re: Kelly vs Sabvoton Controller review 2017

Does anybody know if the Sabvoton Controllers are Sine Wave or FOC? FOC is just a type of Sine Wave controller that gets its timing information differently than a traditional Sine Wave Controller. My electronics understanding is quite limited but I am progressing slowly....the Kelly should have more...
by Bullfrog
Aug 17 2018 1:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: My next e-bike build - BBSHD with hydraulic IGH
Replies: 69
Views: 18517

Re: My next e-bike build - BBSHD with hydraulic IGH

Well IMO they both have advantages and disadvantages....when the popularity of the modular motor increases a little, parts should eventually be more available than the current BBSHD, but for now it is going to be tough to beat the BBSHD for the availability of hop up parts and the price of replaceme...
by Bullfrog
Jul 30 2018 9:21am
Forum: E-Bike Non-hub Motor Drives
Topic: My next e-bike build - BBSHD with hydraulic IGH
Replies: 69
Views: 18517

Re: My next e-bike build - BBSHD with hydraulic IGH

If anyone is concerned about heat, a pic of a temp indicating strip I bought from Wahl is posted at the bottom of this post. I tried to put one directly on top of where the FETs mount in the right hand motor cover and I put one on the left side as well. With the stock 30A controller the 110F did not...
by Bullfrog
Jul 30 2018 8:57am
Forum: E-Bike Non-hub Motor Drives
Topic: My next e-bike build - BBSHD with hydraulic IGH
Replies: 69
Views: 18517

Re: My next e-bike build - BBSHD with hydraulic IGH

TorEddy...how did the Lightning Rod compare to your BBSHD and what wattage were you pushing thru them? I agree 100% on the cleanliness of the BBSHD installation plus with the controller internal, it is protected. Saw another pic you posted that was priceless...looks like you have a future Electrical...
by Bullfrog
Jul 29 2018 12:46pm
Forum: E-Bike Non-hub Motor Drives
Topic: My next e-bike build - BBSHD with hydraulic IGH
Replies: 69
Views: 18517

Re: My next e-bike build - BBSHD with hydraulic IGH

I don't have any personal experience with them but the Lightning Rod (small block and big block) appear to be a well designed set up. I have communicated with the owner a few times and he seems pretty sharp as well as helpful. If I wanted more power than my BBSHD can deliver, I'd take a serious look...
by Bullfrog
Jul 27 2018 8:27am
Forum: E-Bike Non-hub Motor Drives
Topic: My next e-bike build - BBSHD with hydraulic IGH
Replies: 69
Views: 18517

Re: My next e-bike build - BBSHD with hydraulic IGH

TorEddy...now that is one nice looking bike/build and I agree with your comment about the build being as much fun as riding. All this talk about shifting...I don't shift at all. 99% of my riding is off road so that is a factor that you have to take into account. Since an electric motor produces max ...
by Bullfrog
May 30 2018 4:35pm
Forum: Motor Technology
Topic: Geared motor on tough off-road terrain - wrong choice?
Replies: 71
Views: 6452

Re: Geared motor on tough off-road terrain - wrong choice?

Yes I know I am a late arrival to the party but passing along some personal experience.... I started with a MAC internally geared hub motor because I wanted to ride off road and climb hills...bad idea. You can't get it geared low enough to keep it from overheating...and that is the same for a DD mot...
by Bullfrog
May 20 2018 7:41pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBSHD, 1000W, 68mm-120mm BB
Replies: 432
Views: 84677

Re: Bafang BBSHD, 1000W, 68mm-120mm BB

endrew...excellent question. I forget everybody doesn't have the exact same set up as me. You need a display that shows the wattage or amperage...with the DCP14 color display that EM3ev sells you can select wattage or amperage. I believe most of the black and white displays just have a bar graph wit...