AM dual motor = bafang middrive + rear hub motor

[John Bozi]

The rear suspension is on full soft as it never has bottomed out and I don't ever pedal standing up so no bob issues. I always stand up with ass back almost behind the seat on rougher stuff as I learnt from mtb riding. I also try to jump my weight up prior to a bump or obstacle....

I was near buying a used dh bike that would fit the cro at back, but now if I end up building an offroad bike I will be happy with the much lighter and slower 12t mac. I know I can't hammer them over things. Thing with single track there are lots of steps, which will be almost impossibly to go up slowly and running up would cause the same rim issues. On my carbon bike it's a breeze just pull up the front and then pull up the back or just bunny hop almost anything low enough. An extra 20kg of ebike stuff making the bike 3 times the weight just makes that impossible. If I built an offroad bike it would have to just stick to firetrails, which my current bike seems to handle OK apart from the urban tyres.

As you say it was unlucky. There was a lot of erosion where the ground would have been flush with the concrete. And flying off a gutter is no problem, it was just flying up it almost like it brought the bike to a deadstop.

What psi were you running in the rear? I dinged a rim on a gutter thinking the pressure was OK. But it was only 25or something low even though it felt OK. When its up to 50 or so the rim is safe for hitting gutters although you were going moderately fast.

I actually had just pumped the tyres to 60psi which might have caused more stress to the rim. But if they were at the pressure before the pump up I would have pinched the tube for sure.

I'd go a gng if there weren't so many other issues.....

Anyhow, glad some likes my blog...

 

[deffx]

Your right, pretty hard to bunnyhop with a hub motor, even the little macs a struggle to lift plus 20-30Ah of batteries and a dh bike.

Ive got a cheap crystalite 408 coming which im going to use for offroad riding, dont need to go so fast offroad and to have a set of wheels with knobblies to switch in will be sweet.

I also wont stress if i break the motor as i still have the mac for the road, Cellman advised me against using the mac offroad, so i dont think thats a good solution for you either

Yes shame the gng has problems but i believe if you use it at its standard power settings its pretty good, its when you hotrod it it has issues, plus there is the new chain version

Pretty tempted to try one myself, except my frame battery box on this bike is in the way, been meaning to build another/spare bike though

 

[Gt_avalanche]

Hey John really liked reading through your thread..... couldn't help thinking as a fellow newb how i've gone through exactly the same probs all along the way.It can turn into a bloody expensive passion but i guess there are a lot worse ways to blow ones cash. Especially liked the pissed vid :lol: total crake up... Keep it coming mate!

 

[John Bozi]

Unlaced the hub last night, was a new experience for me so made a vid doing it, busy but will upload this week.

I spent ages studying rims: motorbike, downhill etc. I just can't find anything that will match up or not take a month to get to me or at an affordable price. Still contemplating just getting another crystalyte rim because I think it was strong enough, and the strongest downhill rim would have probably still got bent.

ahhhhh.

It took me ages to pull everything off the bike and unlace the hub, it's going to take even longer to put it all back on. I'm planning when I get the new rim to try relacing it myself and then when almost done taking it in to my LBS to true it or take it Newb who now has a great truing device.

2 week holidays finished with a bang all right.

Back to work

 

[John Bozi]

Just ordered another crystalyte rim - couldn't be bothered waiting around any longer.

From now on I'm only going to fly more risky around areas I have done a lot and am sure on what is on up ahead.

Can start looking into other parts of the build now...

 

[devorion]

Just ordered another crystalyte rim

with any luck it'll be up in QLD by Friday, Good luck!

Someone might be able to correct me but if it's possible it might be worth trying higher gauge spokes, 14's or something to allow for more flex in the tire as a whole. though not much is going to withstand the hit your rim took.

Hope you're back on the tracks again soon mate, it's depressing isn't it!

 

[pendragon8000]

Having high quality spokes is more important than gauge (I've read on ebikes.ca) , high quality bike spokes are better than crystalyte's 12g . But the holes in hub and rim are too big for 14g spoke heads and nipples. I'm gunna try the sappim 12g.

 

[devorion]

I had a LBS lace up a x5304 with some DT swiss 14G married up with some brass washers for good luck. Turned out great and the tire had more give in it.

But it always depends on what you can do with your nipples hey

 

[John Bozi]

Yeah would like to hear from an impact specialist.

People say too tight no good too loose no good, tyre too pumped or not enough etc. at the end of the day I reckon that impact will go into something. There's a chance I may have dropped my weight hard down to then pull up the front which may have fully compressed the suspension which would not have helped take away the blow. This was not the wrong move because if I hadn't pulled up the front I would have probably flown into my "shopping bag" with my nuts and then landed in front of the bike. Mind you this is pretty close to infront of the cop shop.

Trivia: this morning I put a $3500 bid on a used stealth fighter which the "seller" has cancelled, bugger.

I also just ordered on of these for the weight weenie 5ah LiPo bricks I plan to put on the bike for my main rides. I reckon they look pretty cool, right size for the lipos and have a "bit" more protection than just material. Even if I didn't go lip they'd still be handy for something.

SUZU Sports Hard-Shell Cycling Top Tube Pannier
Velcro easy & adjustable mounting
680D Nylon + EVA Hard Shell Protection
Water-resistant
Well organized internal pockets

Measurement (One Side Case): 168*125*50MMWeight: 240g

 

[pendragon8000]

http://endless-sphere.com/forums/viewtopic.php?f=6&t=23996&start=5050#p794755
that one?
pm him maby..

 

[John Bozi]

http://endless-sphere.com/forums/viewtopic.php?f=6&t=23996&start=5050#p794755
that one?
pm him maby..

Yes, thanks for the link, I was thinking he was dodgy, but fair enough its been sold to an es dood - he pulled it off ebay, which kind of is annoying when someone posts "NO RESERVE" so you go OK Ill give you my best price and then get home after work and

CANCELLED

 

[John Bozi]

[youtube]Y2jqiyY9x48[/youtube]

Since I have no working ebike I have gone back to mtb.
This is what I hoped an electric bike could take me up so that I could enjoy going down.

 

[John Bozi]

When the left spoke goes over, the spokes push against each other and they are all bent. When I relace this, should I copy the way it came or should I make the left spoke go under as they are straighter and only barely touch?

 

[pendragon8000]

There's some good wheel building info on ebikes.CA . I would copy the way they did it. That's the same way my lbs resident wheel builder did mine. Got it tight and added some non-setting thread locking compound.
Check the driving spokes, I think they are on the outside of the flange. They will stretch more to IMO

 

[Samd]

Haven't checked in on this thread for awhile. Seems like you're still trying to use a DD hub to climb hills John. You could just put your 14s on the downtube in some square bunnings pvc downpipe and use a 14s charger. Eventually get a 14s BMS.

GNG is nice looking at your single trail vids, but a code 10 BPM is ok too for an allround solution.

Nothing wrong with a 4065 - a great beast albeit with short breath. But it might be a bit heavy and lack bottom torque if what you really want is to get up hills so you can hammer back down...

Cheers.

 

[John Bozi]

after doing the downhill sections of the mtb park near my house it reminds me every time

1. You just cant downhill on them because there are people coming up.
2. The hits to a hub motor would either stuff it or the rim, or the spokes or axle or the dropouts. it's just too heavy.

After going full circle thinking I could find a solution. there really isnt one unless it is a mid drive as many have said over again. the mid drive is the best because you dont have that unsprung 10 kg smashing the rim.

anyhow having fun trying to lace this fucken rim. Biggest pain in the ass was working out how to get the nipple from falling into the double wall.

fucken paper clip is doing the trick so far to feed it through... then hold it with a screw driver to start it.

Have gone for the doing it the same way after most people recommended it on FB ES.

I reckon both ways would be fine but for the sake of doing nothing different.

other thing I noticed is the join in the rim. I can see light through it!

is that wrong? thin

 

[pendragon8000]

the pin join in the rim? yeah the crystalyte rim ive got is a bit like that to. i asume the pins go in quite deep and its just cosmetic imperfection
looks something like that inside i imagine:

 

[John Bozi]

Im starting to feel more like I ve been doing this break shit then repair it thing for about a year. bit of vet LOL

Nah. Maybe I should start to stock pile stuff... order stuff that I dont need right now but kno would take ages to get like the best mtb rim out.

anyhow its pissen down rain in brisbane thank god as we need it up here.

great time not to have an ebike.

did you guys see my dream bike to mod if I could ever find a 15 year old version cheap?

 

[Samd]

That is a sweet looking frame. The rear suspension pickup is a treat.

Does look awfully similar in geometry to F-t's GNG mountaingoat.
http://www.endless-sphere.com/forums/viewtopic.php?f=6&t=15066

 

[John Bozi]

I laced the wheel roughly and Newb the champ did an insane job of truing it.

We got it all back on the road. After a brief spin with him I rode toward home.

10 kms of riding since I cracked the rim and loving the ride, BAA BOOM BA BA BA BOOM TICK A TICK A TICK A

FUCKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK

Got off the bike a few ks from home to see what it was, sounded awful, sounded worse than when I cracked the rim. Sounded like something fell off the bike, metalic chunking around.

Looked at all the bolts and suspension at the tyres and hub couldn't see anything wrong. Maybe I just ran over something.

As I get to quieter roads not accelarating there''s a faint click click click click. I'm thinking that's the same sound before I had the first truing of the wheel at Newbs a long time ago. I thought ah well, I can true this from home.

Get home have another good look at it.

DAM - frocking NAIL

I got a patch kit I'll get to when I get some time, but I'm not sure if it will hold and if the big hole in the tyre is a good thing to continue riding with.

 

[devorion]

DAM - frocking NAIL

Sorry to hear that fella, although honestly I did giggle a little because it's not me but at least it's just a flat tyre. might want to check it didn't try and become a spoke though.

I'm having trouble grasping how you got a nail in the back tyre and not the front, other than the front tyre completely missing the nail.. or would it have been nails? facing upwards?

maybe you should retrace and see where this nail came from :lol:

luck to you

 

[John Bozi]

go look through a ton of old bike stuff sure I had a bag to get me out of trouble. Sure do but it was only a spare tube ( a light weight one for my cross country bike with that other valve) and a mini pump. I was hoping to just pull the tube off a bit and patch until I could buy a new maxxis downhill tube but even that would be to nice...

Yeah I highly suspect some bike hating cunt put a plank of wood with some inverted nails on the ground, probably even painted bitumen colour. Because I didn't see anything infront of me and what are the chances of running over a nail lying down then going straight through a hookworm and the tube.

Thankgod the hookworms are so tall and the nail wasn't longer to pierce another rim, oh frock I'm going back down to check the rim again...

it was on a hill that often slows drivers down if a cyclist is ahead of them.

What a pain in the bum.

 

[devorion]

I should have a spare tube about, or ashgrove cycles might be a bit closer, they're open late tonight I think.

Don't thank god for the hookworm, thank Maxxis

the Maxxis DH tubes are great for keeping a tyre on a bike

 

[pendragon8000]

That sux man. You might be able to use some rubber glue and a bit of old tube to patch the tyre but when something similar happened to me I used a spare tyre for piece of mind. Btw with punctures I don't patch tubes any more, just replace them , again piece of mind. Too many times patches have leaked after waiting for the glue yo dry.
Unlucky...
Yeah Devorion, dh tubes are the way to go.

 

[John Bozi]

thanks mate - I'm just going to order $100 worth of maxxis and dh tubes, (shipping free) anyone need a hookworm 26" tube or tyre in North Brisbane contact me ok! I am the official distributor

might as well as I'll end up needing more soon at this rate.

I really dont see the point in patching this hole just as with newbs patching recently - they are good to get you home - but you know its time to order a new tube because itll leak eventually.

I'll visit ashgrove or 99 bikes newmarket for a patch kit tomorrow before or after work.

But it will temporary and Im not riding off the beaten track.

How do you patch a tyre?