Rehabbing a Terminus M55 Mountain Bike

[uberlieb]

I am repairing this M55 bike for a friend of mine, which includes making a new battery pack. The current pack, which is a rebuild of the original, is toast: you can see the leaky cells from the pictures and overall questionable construction.

Does anyone have the manual on this bike or any technical documentation?

Thanks!

 

[amberwolf]

I don't quite understand the round battery pack--is it supposed to go in the in-frame "rectangular" box? If so, that's pretty wierd, and a waste of quite a bit of space that could probably be used for a larger battery. It reminds me of the TidalForce bikes' in-wheel-hub-battery, but it isn't the same.

AFAICT the pack in the image you have there is a 12s 6p pack, which fits with the specs (quoted below from a review page) that say it's 43.2v, but it also says it's 37.2Ah, which would require 6.2Ah per cell, and I don't know of any cells like what are shown there that could hold that capacity. Half that, sure, for some cells.

Assuming the 43.2v is nominal, then typical Li-Ion gives 12s (3.6v), so most likely it would normally be a 12s Li-Ion pack.

6p might be a little low for sustaining the possible load without stressing the cells, which could be as high as 60A according to one of the sources, and another search source shows 200A, which would be way too high for a 6p pack to continuously handle.



The only technical info I could find in a quick search was this

eBikes.org Homepage

eBikes.org reviews the latest electric bikes and provides helpful buying guides, tips, and advice. Browse our selection of reviews today and find the perfect ride for you!

electricbikeaction.com

Germany’s M55 Bike’s $34,000 Terminus uses a custom-made double crown White Brothers fork from Mountain Racing Products. Hope Tech supplies the V2 EVO hydraulic disc brakes with floating rotors. With unmatched power and superior cooling, the V2 is the king of brakes. A 14-speed Rohloff Speedhub is used for the drivetrain.
You might not want to park your Terminus this close to your Ferrari.
Other Features:
Frame: AL 7075 (aluminum) CNC machined / by M55 BIKE
Motor: Brushless (BLDC) from 250W to 2000W / by M55 BIKE
Drive system: Throttle & RPM sensor / by M55 BIKE
Battery: 1320 Wh, 37,2 Ah, 43,2V / Pa/ built by M55 BIKE
Axles: TI Grade 5 (titanium) / by M55 BIKE
Axle’s screws: TI Grade 5 (titanium) / by M55 BIKE
Rear Fork: AL 7075 (aluminum) CNC machined / by M55 BIKE
Fork: Groove 6.3 inch travel / by White Brothers
Shock: MXR Float / by Fox
Internal Gearhub: 500/14 Speedhub / by Rohlhoff
Front hub: Hope Pro2 EVO / by Hope
Tires: Crazy Bob / Big Apple / by Schwalbe
Rims: Mavic EN521
Saddle: Fizik Gobi
Brakes: Hope Tech EVO V2
Handlebar: KCNC SC Bone / or Titanium by M55 BIKE
Pedal: Point Podium
Grip: ESI
Headlight: Supernova M33 LED
Rear light: Supernova Airstream LED
Mudguards: Carbon fiber / by M55 BIKE
Battery container: Carbon fiber / by M55 BIKE
Charge and data connectors: Lemo / designed for M55 BIKE
Chainrings: Gebhardt / designed for M55 BIKE
Other Parts: KCNC (seatpost, bar end plug, clamp, headset)
If $34,000 feels like cheeping out to you, the custom paint option is the way to go.

A search of Archive.org finds some versions of the manufacturer pages,

Wayback Machine

web.archive.org

which include some other info, like this about the battery and some hardware, but no manuals or support info.

To increase range and performance, we’ve developed brushless electric motors driven by super-efficient batteries that deliver raw power and unbeatable endurance. The M55 Terminus is powered by eight battery cells ingeniously built into the bike’s self-supporting frame. The cells outperform any comparable e-bike technology currently available and are made to last – the M55’s motor draws only 60A at full power and our specialist manufacturer guarantees over 90% of ‘as new’ performance even after 1,000 charge and discharge cycles. All this from a battery pack that charges to 80% of its capacity in just one hour –saving you time while conserving precious energy
Frame: Titanium / by M55 BIKE / Hand polished Ti 3Al-2,5V
Seat Post: Titanium / by M55 BIKE / Hand polished Ti 3Al-2,5V
Seat Clamp: Titanium / by M55 BIKE / Hand polished Ti 3Al-2,5V
Front Fork: Titanium / by M55 BIKE / Hand polished Ti 3Al-2,5V
Handlebar: Titanium / by M55 BIKE / Hand polished Ti 3Al-2,5V
Stem: Titanium / by M55 BIKE / Hand polished Ti 3Al-2,5V
Titanium Nitride Coating / by M55 BIKE / Gold or Silver color (PVD coating)
Laser Etched Surfaces / by M55 BIKE / Number Of LTD Editions On Handlebar
Planetary Gear Crankset: / by Schlumpf / High Speed Drive/Black SG-HSD
Belt Drive / by Carbon Drive
Electric drive system / by BionX / PL 250 HT SL, Battery Size XL
Brakes / by Formula / T1 203/180mm rotors
Pedal / by Sögreni / Gold/Silver Handmade
Headset / by Chris King / 1-1/8 Gold/Silver
Rims / by Mavic / Black
Front Hub / by White Industries / Mi16 - Hope Mi16 Silver/Silver
Saddle / by Brooks England / B17 Narrow Black/Brown
Grip / by Brooks England / Plump Leather Grip Black/Brown
Saddle Bag / by Brooks England / Challenge Tour Bag Black/Brown
Battery Case / by M55 BIKE / Black/Brown leather/handmade
Tires Schwalbe / Kojak/Crazy Bob size 26x2,35
.

 

[uberlieb]

Thanks for the feedback. Yep, 12s6p is what i figured out here too. I am using 2500mah cells in replacement so it won't have the (fictional) capacity of the original. The form factor: probably unnecessary, but so much on this bike really is overdone! The space for it is not rectangular but not circular either.

Video I did on the bike so far:

 

[E-HP]

Thanks for the feedback. Yep, 12s6p is what i figured out here too. I am using 2500mah cells in replacement so it won't have the (fictional) capacity of the original. The form factor: probably unnecessary, but so much on this bike really is overdone! The space for it is not rectangular but not circular either.

Is that the battery in the aluminum case in front of the bottom bracket?

EDTI: never mind, I see that's the motor. M55 Terminus Review | ElectricBikeReview.com

 

[uberlieb]

This is how the battery sits in the bike.