Just joined the e-bike world - wow!

[juggernaut1]

Nice. Agree on the plush ride of a dual suspension ebike. That Bafang motor is a perfect match for the fatty. I have the same motor in my Frey Beast emtb.

 

[Ringo9]

You might want to consider 26" X 2.4" Super Moto-X tires as a compromise ?
They'll fit up to 70mm wide rims.

The lower rolling resistance should make a measurable difference in your MPG, and your Beast looks Hungry !!??

Super Moto-X | GreenGuard | Black-Reflex | 26x2.40 | Addix | 11101381.01

WIDE, COMFORTABLE, SAFE! Whether travelling on asphalt or trail, the beefy Super Moto-X offers the best riding characteristics and plenty of comfort. The extra-resilient DoubleDefense construction lets you reach your destination safely, even in the tough…

www.schwalbetires.com

Will save that info for the future, cheers

 

[Ringo9]

Nice. Agree on the plush ride of a dual suspension ebike. That Bafang motor is a perfect match for the fatty. I have the same motor in my Frey Beast emtb.

Do you also experience cog slipping when giving it everything you got on the highest gear and highest PAS at the same time? I've read similar complaints about the M620 in that situation.
If I'm being honest that level of effort is not really sustainable for more than a couple hundred meters at a time, and the speed at those levels is kinda scary so it's only when I have a fully empty and long straight and want to break my top speed record that I "need" to combine all of the above, but I'm just that guy that wants his stuff to work as it should despite using it or not.

I got some recommendations already to adjust the derailleur which I did by following the advice for regular bikes, not sure if strong mid-drives need a different fine tuning though, I tried to close the pully/cog gap by adjusting the B-screw, nothing really changed.
Checked the hanger and looks straight at least to the naked eye.
Cleaned the chain and sprockets thoroughly, still no effect.

I then removed two chain links and on the first ride no slipping occurred and new top speed achieved, I thought "I got it!" Then strangely, on the following rides and top speed runs the slipping somehow came back?!

It's got a 9-speed ALIVIO so no Tourney but also nothing special either. Next in line are a new hanger and a hanger extender, before I splash the cash for a new gearset (current one only has 400km on it)

Open to more ideas to try before dropping money...

 

[juggernaut1]

I have done over 2500 klms and haven’t experienced any chain slipping and I am still the original drivetrain. My bike uses a SRAM 12 speed drivetrain (NX 11-50 cassette and GX everything else). Once I dialled it in on purchase, this drivetrain has been absolutely faultless ever since.

One of the first things I did was change the standard (40 tooth ?) chainring to a 48 tooth chainring which is the largest I could fit without hitting the frame, and without using spacers. The larger chainring did require extending the chain with more links. The larger chainring kept me out of the smallest cogs (reducing wear) when cruising at typically 40 klm/hr. I also only use the lowest level of assistance unless I want a faster cruise speed - the Frey Beast is limited to 60 klms/hr.

I have the Alivio 9 speed drivetrain on my other ebike and yes I have experienced chain skipping in sixth gear after around 800 klms. The local bike shop fitted a new shorter 10 speed chain and this has been fine ever since, with crisper shifting.

I would firstly check the hanger alignment with an alignment tool rather than the naked eye.

 

[PedalUma]

Fortunately I have access to an extended bike road network around here so driving in city traffic is almost never the case, at least for any meaningful distance/duration. Still, I have found out that bike roads are not all "carpet-like" so on a bike like this you are able to maintain your speed without sacrificing comfort. Even more when starting to move out of those, like on local parks and off-road terrain, it just goes over everything so casually I love it.

What I meant by the battery was that sooner or later the battery will go bad, given my commute's length. Who knows if the company will still be around or will still provide a replacement so do I buy a spare original now and keep for the future or is it possible to refurbish it when it's time? My understanding was that the form factor is unique to the bike design so I won't be able to find generic replacements of equal quality (it's got LG cells).
+

As to buying a spare now, that is probably not a great idea if it goes on a shelf. And it is one reason to go for an external battery build so you are not stuck stranded on proprietary island. A battery just sitting will go bad. They need to be cared for like a pet and not neglected. Now, you could get a second and put it into rotation with the first. That way they would both last more years. I rode a 6-year-old battery today that is in rotation.

 

[PedalUma]

Open to more ideas

Look into a Box 4 eight group set. It is very strong and has a powerful clutch. If you are using the smallest/fastest cog regularly, then get a larger narrow/wide chainring to still have the same speed while using a cog with more teeth and with less ware.

 

[PCeBiker]

Open to more ideas to try before dropping money...

Dude,.. Seriously, How long are your crank arms ???

WTF Have you gots goin on here ??,..

Maybe 2" long cank arms instead 1" long would help ??

What you have is a moped.
Same as I have,..
But my pedals and entire crank system are entirely functional.

Good for you for your generous input to your torque converting cranks for recognizing that you were helping


With your ENORMOUS Crank arm/Pedal clearance, you could easily lose an inch or so for a more street oriented tire.

 

[Gionnirocket]

edit:... Yeah a quick Google search indicates that the battery is probably proprietary. I wouldn't say that they are an established brand, but they do seem to have a faithful following. If you did want to play it safe and not rely on finding a third party rebuilding service I do like the previously proposed solution of adding a battery to the rotation. That said I'd want to be confident about long term ownership first.

Also... Do you know which version of the M620 you have? UART or CANbus?
Reason being that the UART version is end user tune'ble and you can tweak each PAS as you like as well as smooth out the acceleration curve if need be.
Easiest way to tell is to look at the display connector

 

[PCeBiker]

Nobby tires at high speed don't have very good traction with asphalt.

Street treaded tires off-road are but sometimes you fall over,..

I would much rather take a on-road treaded vehicle off-road, than take an off-road vehicle on the road.

In fact it wasn't even legal for my dirt bike.
I needed to install trail tires to be legal AND SAFE On pavement,..

It doesn't matter how much motor or braking power you have, it all boils down to the tire contact with the road/trail/path whatever.

Tires Are Critical.
Especially with High Power




My full suspension Fat e-bike came with Kenda nobby tires.

I switched them out for Shwalbe Super Moto-X after the first test ride.

Oh, BTW,..
It sounds like you're traveling more than twice as fast as I am willing to go (32 kph)

If you have a tire blow out at speed, It's Very Dangerous.
You need to take your tires seriously.

And a flat tire, even if you get pulled over safely , Really Sucks !!

Don't forget the Flat-Out

 

[Gionnirocket]

I concur... I hated the Schwalbe Johnny Watt tires on pavement... they broke traction way too easily.
My current Schwalbe Al Grounder are an SUV tire that is more pavement oriented but still work well enough off road (for me).
Very smooth and quiet on pavement.
Super moto (X) don't have any off road rating....
ymmv

 

[PCeBiker]

Super moto (X) don't have any off road rating....
ymmv
View attachment 197356

Yeah, they aren't too great in muck filled puddles, but I did manage to get up this hill without even standing on my pedals,..

 

[PedalUma]

Super Moto-X

This is my second bike build. It was 2018 and a Bafang BBS02. Look at the weird chain stay. I loved those tires. It was only my second build so I didn't have the clean and light thing down yet. I did race and beat a 350 pounder on a Harley with it to the next light. Those engines are powerful but they need revs. That bike had torque off the line. I pulled up to him at the head of a red light and said 'Nice bike. Want to race to the next light.' He just laughed at me.

 

[PedalUma]

I did this hill this week with a friend on this bike. And we didn't get crumpets, it was burgers.

 

[PCeBiker]

I concur... I hated the Schwalbe Johnny Watt tires on pavement... they broke traction way too easily.
My current Schwalbe Al Grounder are an SUV tire that is more pavement oriented but still work well enough off road (for me).
View attachment 197356

OK,. Your tire is probably a much better choice than mine, but I think you and I aughta team up and convince @Ringo9 that he should Seriously consider his tires.

Not so much the big fat assedness, but the tread and puncture protection underneath the tread and inside the tire.

As an FYI anecdote,.. if I hit a really rough patch for more than a few feet at speed, my motor completely shuts down.

I'm fine floating along above, but my rear wheel and all the sensors are bouncing are over the fluckin place and it shuts down.

@Ringo9 mentioned gears skipping,..
If his derailleur is bouncing all over the place, it can certainly derail.

Was a derailleur clutch mentioned as a fix ??

 

[PCeBiker]

I did this hill this week with a friend on this bike. And we didn't get crumpets, it was burgers.
View attachment 197361View attachment 197362

Seriously @PedalUma , I couldn't last ten minutes on that seat.
And I can't lean over at all.
If just isn't comfortable for me.

 

[PCeBiker]

Pic of the bike:
View attachment 197251

I noticed that you have the same rear shock as @Gionnirocket and I,..

If you want to learn how to take it apart and wreck it, I can help with that.


Thread 'Rockshox Monarch RL... Doesn't fully extend?' https://forums.electricbikereview.com/threads/rockshox-monarch-rl-doesnt-fully-extend.57523/





Either way, it's probably gunna need some fancy grease eventually,..

 

[Gionnirocket]

I think it better to let Ringo enjoy his bike for a bit and let possible future upgrades present themselves through want or necessity

 

[PCeBiker]

I concur... I hated the Schwalbe Johnny Watt tires on pavement... they broke traction way too easily.
My current Schwalbe Al Grounder are an SUV tire that is more pavement oriented but still work well enough off road (for me).
View attachment 197356

I was having a hard time finding a 26" Shwalbe fat-tire, but I found this,..

 

[PedalUma]

I couldn't last ten minutes on that seat

The cargo PickUp's kicks butt. My friend Natalie has those on her heavy cargo kid hauler bike. For over three years she has never had a flat and it still does not need a rotation swap. They still look new. 90% of her trips in town, like dropping off kids and shopping are on that converted steel Mundo.

That saddle only looks like torture from the side. It is the most comfortable I have ridden. It is a Bontrager. Supper soft and Flexi with the air vent in the middle. It is a wide-ass saddle. The thing at the back in the middle, sticking out is for clipping on a rear Bontrager light. It is nine inches wide, the circumference of my rooster.

 

[PedalUma]

Here is a H-Bar wire check on that white bike. And to double check for any ugly connectors or fatness. Those masts on boats are ten miles away from that hill's top. The top mast is thirty-feet tall and 100 yards away. It is a big hill and Gracie, a friend, did it to the top riding an SL Vado I sold her. It is just over 2000 feet and sometimes it even snows for half-a-day up there.in January before it melts, so we can look at a distance and admire the beauty of distant snow a for half-a-day about every ten-years. I like looking at snow each decade for half-a-day as long as it is ten miles away.