New 24' slopestyle freeride build, getting serious!

bzhwindtalker said:
I don't know if you should buy one... I examined the broken weld, and it seems that the welding did not penetrate enough, making the weld weaker than it should have been. Bottom line : those frame are beautiful, quite lightweight and dirt cheap. The videos I made attest the kind of riding I did with it, and it does not seems extreme at all to me. It depends on the kind of riding you do I guess, but for a street racer, frame strength should not cause issues...
Click to expand...

Well I wouldn't do things you do on your bike :p Just street riding probably. But I'd have to buy all parts for the frame apart and I think it would be cheaper to just buy a complete bike. Thought that frame is beautiful :D
 
That setup, as portrayed in that video, is just amazing. The torque on demand looks very controllable.
 
Yeah, control is amazing, nothing like my previous bike!
Sure, this hub is heavier than a RC equivalent motor, but controllers are available and well documented, and the greater inertia makes riding it more like an ICE.

What do you think about my new swing-arm? It is a work in progress, but I like how it looks on the bike. It is made from 35x25x1,5mm mild steel, so I fear that it won't be strong enough on the under side of the bend... I may weld a plate to put more meat there.

7087604897_a38f2e482e_c.jpg

7087610811_1276f763ba_c.jpg

7087614675_13099375a1_c.jpg
 
Looks great!

How would a q100 geared motor work for middrive? Say at 48v.. 20ah?
 
I have no experience with cute motors, aren't they rated 500w max? I have no idea if they would handle 1200w for long, But if they do, they would be a serious option! The only drawback is that they probably have an aluminum freewheel thread, that may make securing the drive sprocket more complicated, but then they have the advantage to freewheel internally!
 
I would just put a simple plate over the weld on the sides of each miter for the bend and it should be fine. Mild steel is plenty strong, it just likes to bend, so you need to make sure its stiff enough. Plate it over after welding and then welds the plate totally and you should be fine I would think. You don't mess around do you?!! I wish I had your free time! LOL!
 
On second thought, why not run a simple gusset from the shock mount down to the axle area? That would guarantee its strong enough. a simple 3/4" square tube would suffice...
 
Do you have a link to the frame? I really like the looks and it seems decent geometry. I might like to get one simply to copy everything easily for my design I am working on. I am hoping to offer complete turn key bikes within the year using my Trail Drive setup integrated into the frame with a battery box like Timme's
 
Speaking of free time... I work 35hour a week for my internship, plus schoolwork, with almost no holydays! But... I never watch tv, and I try not to waste time on the internet ;)
 
LOL, sounds like my schedule, but replace school with work, and then add in Momma and Baby time, pretty much leaves NADA. LOL! I Create time on a regular basis, I could likely win the Nobel Prize for mastering Space/Time... :)
 
I linked the ebay add were I got the frame just on last page Whip! but as you are in the us, i would recommend getting one of those instead :

c1c83b7addcacc1c076581744edd1e47.jpg



they are not that expensive on ebay... http://cgi.ebay.fr/MOUNTAIN-CYCLE-BATTERY-5-Park-Mountain-Bike-Frame-NEW-/330706575699?pt=Mountain_Bikes&hash=item4cffa5e153


more expensive, but those are real slopestyle frame with 5" of rear travel and a frame made to take a beating. I think it uses through axle 150mm rear hubs, $$$...

I would get one but shipping is 200$!!




Today I spent 3H of $h*t trying to change the bottom braket on my bike, and when i finally got the old one out and cleaned the threads, the new one wouldn't get in, at least not straight, putting load on the bearings... I finally gave up and screwed it the most I could :/

This is how i finally got it out, and it was still super hard to turn :shock: :

7091059431_dfa25b2622_c.jpg

6944987226_a569d163ed_c.jpg
 
beef
7098547103_dbd501de53_c.jpg

7098559047_3563e5d316_c.jpg


I went from 24 to 30t on the crank, and got everything quite well lined, no more chain skipping, even starting up on highest gear!
Now I just hope that the swingarm will survive some more intense offroad stuff :)
 
The video should be online quite soon, it is unedited, it just shows the part where the frame failed. It does not seems like a huge jump on the video, but it was actally a quite decent one. We are creating a new sport guys, this is so amazing!

[youtube]LS31rLtULok[/youtube]
 
Trail riding on these ebikes is amazing, no?

Don't know the first thing about metal fabrication, but do know that I'd love to be able to use a gear drive motor instead of a hub mount for my trail bike. I much look forward to seeing where this build goes.
 
Thats an easyer fix than fabbin the swing arm at least.
you prolly already have it straigthend out & boxed up for strength. looking foward to seeing you with it all crossed up in a one handed turndown. :p

+1 for e-bicycle motocross! the next backyard sport to go huge!
 
I modded the swingarm, the heavy and ugly way... I'm not proud of this, but at least the bike is back in a rolling state. I will probably buy another frame of the bay, and try not to push the limits too much while I search a frame up to the task :roll:
 
Bummer! Remember when i said to triangulate it back from the shock to the axle... Would have eliminated the failure... Oh well glad its back up and running!
 
Yeah I know... but i only have a stick welder :/ okay for simple or thick stuff , but tricky welds are almost impossible. And I can only work ouside too, wich sucks with the weather we usualy have here!! I wish I had a real workshop and a good quality tig or a brasing rig, I could do so much better work!
 
I can understand that, stick welding is a pain in the a$$!
 
Just an update to say that the bike has been running strong for the past 2 hours of riding, I think I bottomed it out once, but no damage.
It gets beaten hard every single time I take it for a spin, and takes the abuse like a champ.
The range is quite good, I can now reach new playgrounds from home! Expect new vids with interesting technical sections and fast trails blasting if weather stays good :)

6973105680_3a90506e4a_c.jpg

7119194175_80e7bda9d2_c.jpg

7119198481_82b147b00f_c.jpg

7119201857_569a2f15bc_c.jpg


This was still looking better in my opinion, but it broke so... :roll:

7098567765_4e396bd17e_c.jpg



At this point, I consider the drive system fully reliable

I found a source for quality steel tubes at a decent price, time to get the custom frame project firing again, and make it mid drive compatible :)
 
You must log in or register to reply here.
Back
Top