motomech
10 MW
addicted2climbing said:d8veh said:My main bike has a 48v Xiongda rear motor. It's done 4000 miles and is still going strong. The low gear is only necessary for exceptionally steep hills - like more than 25%. The Q128 would be better if you don't have such hills.
You can't fit the front motor to suspension forks if you have a disc brake. The rear one is very wide, so you need to stretch your frame a bit to fit it. If you don't fit a spacer to the left side on the axle, which makes it even wider, you have to build a substantial off-set to the rim, which means low spoke tension on one side.
Hello D8veh,
I am glad you found this thread as many suggested I contact you or search out your threads for answers. Since my first post to this thread, a few things have changed. What has not changed is my need to commute 11 miles each way on mostly flat ground with a bike with 700c sized wheels. I can charge at work as well if needed. I do plan to pedal and want the motor just to keep my average speed up. Id like to be in the 20-24mph range with pedaling. I plan to commute at least 3 times a week and I am in Los Angeles so cold and wet weather is not much of an issue. I had originally considered converting a Cannondale Contro 3 which is on clearance at REI but the greasy chain turned me off to a commuter. I then found the Priority Eight and like that it has a gates belt drive and IGH for a similar price to the Cannondale. The IGH is an 8 speed nexus so perhaps not the best for a BBS setup strength wise. I looked into the BBS setup, but spoke to someone with the same bike and to do it they had to cut the bottom bracket to get the belt back in line. They know that designing a special sprocket would do it without modding the bike, but they chose not to since they are a commercial outfit and gates wanted too much to license the tooth profile on a product they would sell. The GATES sproket has a bolt circle too small so there is no way to just make an adapter as it hits the motor before being back in line. I could design a one off myself in solidworks but would prefer the easier method of a front hub motor. If I ever decide to go the BBS route at a later date, I can just move the hub motor setup to my wifes bike.
So after speaking to many people on the group as well as Joseph at EM3V I was steered toward two setups. On the EM3V side Joseph recommended a MAC 350W motor and a 36v shark type battery. Joseph says I should be OK with two torque arms on a 6061 fork. The fork is rigid so the fork dropouts are more stout than an aluminum suspension fork. The MAC setup happens to be on sale which is nice as well.
Most posters on here feel that the MAC is way more motor than I need and many recommended the Q100h setup for its lightness, lower torque on the fork and its ease of integration. The Q100h is listed as a 36V motor but most here recommended I go 48 volt. Any issues with that on the Q100h? I am not looking for absolute high speed or much hill climbing, but my concern with the Q100H is that I am sure to use my bike elsewhere and will encounter hills. However, I will always be peddling to help. Does the Q128 fall somewhere between the Q100H and the MAC 350W? SHoudl i be considering the Q128 as well with my fork setup? Should I consider it and swap it for a steel fork? My concern is I need a 700c steel fork with a disc caliper mount in the same location.
At the moment I am leaning toward the Q100h on 48volts but have questions on setup and which controller to choose. Id like a clean setup so the idea of the controller in the shark type battery seems appealing. Also I don't think need all the bells and whistles on displays and such, but I am open to any and all advice. I plan to order the bike next week and may ride it as is and get some measurements before I order the motor kit.
Yuu seem to be well regarded on this site so I would like to hear your thoughts on all this. Oh and I am 230lbs and 6'4" tall so the bike will be pulling a bi of weight.
Take care,
Marc
Oh and I am 230lbs and 6'4" tall so the bike will be pulling a bi of weight.
Now you tell us!! :lol:
If you use the 100H, get the 201 speed.
I weigh 230 plus and while the Cute will haul you around, there will be no reserve.
I believe you picked the Priority 8 because it embodies what you want in a bicycle and that's understandable, but with any system more powerful than the Cute, it's "bicycleness" becomes less and less important. That's the key element that novices don't get until they ride an Ebike w/ more than a little assist motor. The pedal stuff just doesn't matter.
I think the take-a-way from all this discussion is the P.8 will not take any hub motor larger than a geared mini-motor.
Sooooo, if you are sure that you will only be on the bike path and 20 mph is fast enough, the P.8 w the Q100H "201" will work well.
But if you are like many of us, you end up liking your Ebike so much, you will want to start using it in other contexts and you will find the P8/Cute limited.
I haven't mentioned it, but I have had both, a low-powered Q100H "201" powered"assist" bike that was built for "paths";
https://endless-sphere.com/forums/viewtopic.php?f=3&t=68756&p=1036885&hilit=+idrive#p1036885
That bike was stolden in Mex, but I liked so much I'm building another right now. Another GT I Drive w/ a Q100C "201 rear motor on 46V/17A.
Payed $350 for that bike, like new, / new tires and lot's of accessaries Used mountain bikes, especialy those w/ 26" wheels are the best value in Ebiking. 27.5 and 29 wheels are so trendy that people are giving the older 26'ers away on Craigslist. Luv the plush suspension and disc brakes. (My weight and back precludes ridgid frames).
So I will have both a 20 mph pedal assist and a 25 mph a "round towner".
If I could only have one, I would go with the more powerful bike. I can dial down the power on it when I want a workout.
Can't dial up the power on the assist bike.
Really, it's hard to beat the UEB(universal e bike)for value and versatility
And that is a large geared(Ezee, BPM, Mac and BMC) rear mounted in a mountain bike.