I've gotten a couple opportunities to talk with Todd @ Electric Motorsport and take a real close look at the GPR-S. The longer opportunity was at the Solfest a couple weeks ago at the Solar Living Institute. They had a booth at Solfest and I hung out for hours with them talking about everything including a real close look at the GPR-S. They were also at the Stanford EV Rally today but I was so busy I didn't talk with them much.
The GPR-S is really really really nice looking. Very sharp, and appears to be very well put together.
He told me they are working with a factory in Thailand which had formerly built Kawasaki motorcycles. In other words, a professional quality motorcycle factory. They worked on a custom frame design that's specifically geared to hold thundersky cells. They can currently get enough for a 60v pack, and I think they are 60ah cells but not sure. He said something about a possible tweak that could get them to a 72v pack but I suppose that can't be a guarantee of course.
As it says on their web site the motor mount uses a standard bolt pattern and there are several motors you can mount on the bike. The brushless ETEK, SepEx, an AC motor, etc. I think the standard is the brushless ETEK. And they have access to a variety of controllers. I wasn't able to get a clear story whether the bike will be delivered with the standard motor and controller, or whether you specify which motor/controller you want when you order the bike. I'm pondering buying one myself and Todd said they'd build it for me however I want.
The bike looks real small and skinny, and they said the total weight is 285 pounds. Gosh, the battery pack on my Lectra weighs almost that much (200 lbs).
They have optional trunks and saddlebags available.
There's a computerized dashboard tho I think it doesn't have functions equivalent to paktrakr or cycle analyst. If you want a cycle analyst electric motorsport does stock them and I'd think you could talk them into building a CA onto the GPR-S.
They've geared it at 65 miles/hr top speed .. quoted range is 30 miles at 65, or more like 60 miles at some lower speed.
The story with BMS and/or charger. He talked about two options and perhaps both are sold with the bike. One is they have this BMS unit which is a largeish box, made in China, has a large multipin connector you plug into the bike. The other is a "fast charger". What Todd suggested is the fast charger can be carried on the bike, and they'd configure it to give a 90% charge .. that is, so that the fast charger is not going to overcharge the pack. Obviously the fast charger doesn't have BMS capabilities, and if it's configured so it doesn't put the voltage above the high volt threshold then the pack (knock on wood) won't get overcharged cells.
The BMS unit is large enough to make it inappropriate to carry on the bike. The tendency will be to leave the BMS at home. If the fast charger is small it can easily be carried on the bike for opportunity charging around town.