Modification options for BBSHD?

[voidedwarranty]

I know there are a ton of ways to go, I'm looking for testimonials from people who have done some modifications to their BBSHD. I have a Biktrix with a BBSHD and dual 52v batteries. I feel at some point over this coming winter I would like to "hot rod" it up a bit probably while maintaining the batteries I have. So what does everyone have? What do you like or don't like? Would you have done anything differently in hindsight?

 

[K PierreR]

If you are hell bent on hot rodding your BBSHD and want to stick with 52 volts I think the best option would be to go with Grin Technologies PhaseRunner MT, the Bafang harness and the CA-3 readout and put in a thermocouple. The Grin stuff allows for much more flexibility in playing around.

 

[tomjasz]

The Grin stuff allows for much more flexibility in playing around.

And promotes replacement part sales as well as bare motor sales! Just sayin...

 

[voidedwarranty]

What about chainrings? I've brought this up on other threads but if I wanted to start small and work up to the big stuff I figured this is the part to start with. Currently the bike has a 44t chainring and a 10speed Shimano cassette 11-42 riding on 26x4.8" fatties. I've done some testing on top speeds and find my 6th gear (21t) can get me to roughly 30mph. Using the speed by cadence calculator this means the motor can spin up to 150rpm at the crank. What I'm finding is in top gear (11t) the bike struggles to go any faster than 30mph which equals only around 80rpm at the crank. So here is the question.

Will the 40t chainring help in maintaining and surpassing the 30mph in 10th gear or is the weight/wind resistance just too much for the power of the motor? (Bike weighs somewhere around 90lbs and I add 230lbs to that)

 

[linklemming]

To calculate all sorts of things like your asking, check out this thread and the Grin motor simulator tool.
https://endless-sphere.com/forums/viewtopic.php?t=100461

Im just diving into an BBSHD myself. I do plan on playing with all the settings using an eggrider display. A cable can also be bought to set thing with your PC.

I dont plan on going anything past 1000-1500W, thats more than enough for me and anything higher requires a monster battery. FWIW, 1500W seems to top out about 35mph.

I might get a grin phaserunner and cycle analyst eventually more for programming versatility than all out power.

Lots of good info on BBSHD hotrodding on endless-sphere

 

[tomjasz]

More speed? Larger chainring, not smaller. BBSHD was designed around a 46T.

 

[voidedwarranty]

So I bought this. I was getting annoyed with my 10 speed derailleur. Frankly 10 speeds just felt like too many. It came with an 18t cog but I think I'm going to switch it out for their 24t instead. So the bike will have a 44t chainring and 24t rear cog. Doing the math from SA my 3 gears should be equivalent to gears 3,5,7 on my current cassette. The one speed bike chain and chain tensioner are still in transit. Now I have to figure out how to lace up a wheel. I watched some videos and I have a good comfortable feel for the process. It's more the selecting the correct spokes that's got my head spinning.

 

[voidedwarranty]

More speed? Larger chainring, not smaller. BBSHD was designed around a 46T.

I saw your handle on a thread either on endless sphere or one of the other forums about doing the sturmey archer conversion and you ended up selling it. Can I ask what stopped you from going through with it? Just finished lacing up mine and now I'm working on truing it.

 

[tomjasz]

There was a compatibility issue with the bike I wanted to use. The version I sold also had an integrated brake if I remember correctly. I'd also seen quite a few SA failures with a BBSHD.

 

[voidedwarranty]

There was a compatibility issue with the bike I wanted to use. The version I sold also had an integrated brake if I remember correctly. I'd also seen quite a few SA failures with a BBSHD.

I ran in to quite a few problems myself. After about 3 weeks (don't get much free time) it's finally done!

Problems included:
-Rear dropouts 190mm, SX-RK3 is 170mm
-supplied grip shifter doesn't mount clean to brake lever.
-new single speed chain was too short.
-loss of PAS and throttle in 2nd gear only.
-vertical dropouts only
-never spoked or trued a wheel before (LBS quoted 6 week turn around and didn't sound like they wanted to get involved)
-chain tension caused some issues when given anything more than 200watts.

There were actually a couple more issues regarding the fit of the hub to the dropouts and some parts that didn't come with the kit that the instructions for the hub showed as being used. In the end it's all up and running just fine. Full throttle to 30mph no problem.

44t chainring and 20t rear cog. After all the math I've got the equivalent of 4th, 6th, and 8th from my original 10 speed.

 

[voidedwarranty]

I don't have experience with it, but here goes.

Ludicrous V2 Controller

Distributors and builders of life changing electric bikes.

lunacycle.com

Thanks. They refused to sell it to me without buying a bike or motor from them. It looks like the power upgrade will come from Grin. I want to hold out for an update from Watt Wagons. He has mentioned a possibility of them making an X1 style controller for BBSHD but it would be 2022 at the earliest.

 

[tomjasz]

Ludicrous and SA Hub. For some, a disastrous combination. YMMV