Go Back  Bike Forums > Bike Forums > Electric Bikes
Reload this Page >

K2 Attack 2.0 with a 8fun mid-drive?

Electric Bikes Here's a place to discuss ebikes, from home grown to high-tech.

K2 Attack 2.0 with a 8fun mid-drive?

Reply

Old 12-04-15, 04:28 PM
  #1  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
K2 Attack 2.0 with a 8fun mid-drive?

Hello.
I'm new here and am starting a build using a K2 Attack 2.0 with a 8fun 750 watt mid-drive. Any help with using this system would be a big help.

The first I built a stand for doing general repair and then the building the E-Mountain Bike.







I will build a wood insert for the bike frame clamp. Don't want to scuff things up !

So thanks for any input !
Randy
K2AZ is offline  
Reply With Quote
Old 12-04-15, 05:09 PM
  #2  
2old
Senior Member
 
Join Date: Jul 2014
Posts: 1,252
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Good platform for BBS02; presumably 68mm bottom bracket; pretty easy installation; you'll need standard bottom bracket tools and a lock ring spanner wrench (or socket that fits the lock ring). Watch for gap when installing bracket on motor (both sides where you clamp with allen bolts). There was a gap in my unit and I needed to put a spacer (washer) there. Biggest challenge might be where to put battery. By the way, Luna Cycle's 52V battery works well with this conversion.
Also, if you need cassette or rear derailleur Shimano 8 speed/Altus system ($20 or so each at Amazon) and Shimano chain seems to be wearing well. I touch my brake to cut motor when shifting, but you may have a unit with that built in.

Last edited by 2old; 12-04-15 at 06:14 PM.
2old is offline  
Reply With Quote
Old 12-04-15, 11:33 PM
  #3  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bike in holder. Works pretty good. Need to make the guards for the clamp but good for testing.



Also installed a new cassette and chain. Stand work well for that, so ?

2old, looked into the Luna Cycle's battery. Also found their Mid-drive. Looks interesting ? May go that way ? But need to know more about what would need to be built. Sent a Email and asked for the install manual. Will see what comes back.
Randy
K2AZ is offline  
Reply With Quote
Old 12-05-15, 09:24 AM
  #4  
Robert C
Senior Member
 
Robert C's Avatar
 
Join Date: Sep 2006
Location: Salt lake, UT
Posts: 2,037

Bikes: This list got too long: several ‘bents, an urban utility e-bike, and a dahon D7 that my daughter has absconded with.

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 284 Post(s)
Of course, mid drive is a good choice for a full suspension bike (less un-suspended weight) I am interested where you will put he batteries. There seems to be some room in the frame; however, I don't know if a triangle pack will fit.
Robert C is offline  
Reply With Quote
Old 12-05-15, 09:36 AM
  #5  
2old
Senior Member
 
Join Date: Jul 2014
Posts: 1,252
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
The triangle battery bag will be a challenge since it attaches to the top tube. I have a similar frame with a different propulsion system and am using a front rack for the battery. The 8FUN (Bafang) BBS02 is a pretty straight forward install especially since you have good fabrication skills, but you will need some specific tools. Mid drives seem to be specified IN GENERAL for hilly an/or off road riding. If you ride in flat areas, you might look at the YESCOM (accesseries or something on ebay) 1000w, 48V kit ($200-$250), but you will need torque arm(s) since that LOOKS like an aluminum frame.
2old is offline  
Reply With Quote
Old 12-05-15, 10:38 AM
  #6  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yep,the frame is Alum.

I got a Bike tool box and it seams to have all the tools to work on a bike so far. Pulled the cassette with no problem. And it has other pullers.

As for the battery pack I'm still working that out. Can make my own packs. But it will come down to the mAh size ?

Also looking at the Cyclone Mid-drive 3000 watt system. Looks to be a system that is NOT a plug and play but the price is a little lower and it has more power.Doing some reading about it and others.

When it comes to where I will be using it will be a mix. Some commuting to my shop and some offroad. Fire trails and bike trails.

Now after a lot of power but at 64 going on 65 years old, I'm looking for some help. LOL

Are their any builds that I need to look at first ?

Randy

Last edited by K2AZ; 12-05-15 at 10:47 AM.
K2AZ is offline  
Reply With Quote
Old 12-05-15, 04:08 PM
  #7  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Been playing with the battery placement. The cardboard is 10 1/2" x 4" x 3 1/2" battery with 52volts and 11.6 Ah. This is a Luna Cycle battery. Could be mounted to a side opening box mounted to the chassis studs.



And a drawing of a battery I would need to build. I call it a "pie" battery. its 112 , 2850 mAh 18650 cells. 14S 8 P = 51.8 volts and 22.8 Ah. About 13 lbs. +-. Will be a little hard to build but just look at the power ! LOL Would need a set of seat tube brackets to mount a side opening battery box.Also need to find a place for the BMS in the pack. And it fits in the frame. This would be for long rides.



Also think I will go with the Luna Cycle, 8fun 1000 watt motor. The cyclone looks like lots of #u $%ing around ?

Randy
K2AZ is offline  
Reply With Quote
Old 12-05-15, 05:21 PM
  #8  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Looks like a BMS for a 14S x 8P is going to be a problem ?
K2AZ is offline  
Reply With Quote
Old 12-05-15, 05:32 PM
  #9  
2old
Senior Member
 
Join Date: Jul 2014
Posts: 1,252
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Ask Eric; I think you could convert with the cyclone, but the 8 Fun will be easier. IMO heavy hubs are not very well suited for off road (unless it's just a dirt road) since their weight is a detriment. They feel fine on the street though and don't influence handling as much as might be anticipated. Tire choice was a consideration FOR ME since I don't want a flat on the motorized wheel so use Schalbe Marathon tires. For the mid drive you'll need tools to remove the bottom bracket which is probably a sealed unit. Look at the endless sphere site and read some reviews of various propulsion systems. Electric fat bike has information, maybe not exactly applicable, on the 1000w 8 Fun.
2old is offline  
Reply With Quote
Old 12-10-15, 05:22 PM
  #10  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Think I will stay with the 750 watt.Will go on faster.

Weighted the bike to day. 38.6 lbs. So with the battery and motor looks like 58 to 60 lba. Don't know if this is bad or OK ?
K2AZ is offline  
Reply With Quote
Old 12-14-15, 12:13 AM
  #11  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have been doing some cleaning on the chassis and some riding. The rear tire just didn't feel right. And the rear disc was not squair in the caliper ? Then I saw it. It is the top upright.



The guy I got the bike from is maybe 18 and must be 235 Lbs +. Looks like he landed hard.

I will build a holder and pull it back into shape. 50/50 chance ? Will use some heat to try to help it relax. Just a heat gun,something in the 175 /225 temp range.

If that fails, I will need to fab up a new one.

Oh well , at least I'm getting to know the bike ! LOL

Also working on the battery pack. Its a 13 / 8 .


Last edited by K2AZ; 12-14-15 at 12:19 AM.
K2AZ is offline  
Reply With Quote
Old 12-14-15, 07:47 PM
  #12  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
All better ! What a pain. But on to better things. Oh , all the setup needed to be redone. But no brakes rubbing and seams to shift better.

K2AZ is offline  
Reply With Quote
Old 12-14-15, 08:33 PM
  #13  
350htrr
Senior Member
 
Join Date: Jul 2012
Location: Canada, PG BC
Posts: 3,521

Bikes: 27 speed oryx with over 39,000Km on it, 11,000Km with a BionX assist on it

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 827 Post(s)
Nice scoop WRX ?
350htrr is offline  
Reply With Quote
Old 12-14-15, 10:47 PM
  #14  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Nope. 1998 ,Rally Forester with 1994 JDM STI gear. Been building it for a year or so. Doing some street testing now.FAST !



Not trying to show off,just like building things. Like the EMountain Bike.
K2AZ is offline  
Reply With Quote
Old 12-14-15, 10:54 PM
  #15  
350htrr
Senior Member
 
Join Date: Jul 2012
Location: Canada, PG BC
Posts: 3,521

Bikes: 27 speed oryx with over 39,000Km on it, 11,000Km with a BionX assist on it

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 827 Post(s)
Ahha, nice, I had a WRX, and an STi, chipped them both, and for 4bangers they were very fast... in the 13s and 12s in the 1/4...
350htrr is offline  
Reply With Quote
Old 12-14-15, 11:53 PM
  #16  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks 350, its hard to not go fast in car's with turbo's ! So far no tickets,yet ! LOL
K2AZ is offline  
Reply With Quote
Old 12-22-15, 01:37 PM
  #17  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Got the ok from the Wife and my 8fun 750w with 52V 11Ah battery are on order with .
With luck maybe I will have it running by X-Mass ?

Should I do a build with photos ? Or has it been done to much ?

More to come. Randy

Also found some plans for a recumbent Trike plans. Looking into building one for my Wife and if it goes well maybe one for me ?
K2AZ is offline  
Reply With Quote
Old 12-22-15, 10:16 PM
  #18  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Man the guys are fast ! Parts will be here Thus.

Big THANK'S to !
K2AZ is offline  
Reply With Quote
Old 12-23-15, 04:56 PM
  #19  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm stoked ! The package is in town and will be out for delivery Thursday !

Also worked out a mount for doing the build. What do you think ? LOL

K2AZ is offline  
Reply With Quote
Old 12-25-15, 10:53 PM
  #20  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Got started on the kit. Gave up on the video,I sounded stupid !

Had to make some spacers for the left bracket to motor. If you pull it down it would bend. Had a gap of .125" so I found a nut that size and redrilled the hole.

The other problem I had was the bling ring is very close to the lower trailing arm. Will open that area on the arm with just a little grinding. The arm is pretty befit their.







Also will need to add some inserts to move the battery up just a little. Think most of this is just me wanting it right ?

Will mount the battery and maybe some testing Sat . ? Oh, got a cool horn for X-Mass.
Randy
K2AZ is offline  
Reply With Quote
Old 12-26-15, 07:07 PM
  #21  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This was a fun build !

Running weight will be with a heavy jacket and this heavy guy (LOL) 250 Lbs. Bike is 38.6. Mid-Drive system as installed 15.8. That gives me a Bike with battery and mid-drive of 54.4 Lbs. Heavy ??

So test drive was going to be just around the block. Well that turned into 5.6 miles. What a blast! It's like being 25 again. Top speed with me helping (and I am way out of shape) 26.4 mph.

It's just a hoot ! Big time. After ride battery shows full ? I will take it down to auto shut off and then recharge for the first time. I ran it the way it came from Luna Cycles. Also did some steep and I would not been able to do it without the help. Going on to be 65 I need all the help I can get ! LOL











Rigging went well and I may redo it but for now its all good .

Randy
K2AZ is offline  
Reply With Quote
Old 12-27-15, 12:03 AM
  #22  
2old
Senior Member
 
Join Date: Jul 2014
Posts: 1,252
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Neat job; guess 8 Fun hasn't straightened out the problem with the motor alignment since every build that I've seen, mine included, needed a "spacer". You should be able to easily go 30 mph, throttle only with 14s fully charged at 58.8V.
2old is offline  
Reply With Quote
Old 12-27-15, 02:13 AM
  #23  
tds101 
Grumpy old man,...
 
tds101's Avatar
 
Join Date: Aug 2012
Location: Mastic Beach, NY
Posts: 2,577

Bikes: 7+,...

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 460 Post(s)
Sweet build! I wish I had the guts to attempt it,...
__________________
If it wasn't for you meddling kids,...
tds101 is offline  
Reply With Quote
Old 12-27-15, 10:17 AM
  #24  
2old
Senior Member
 
Join Date: Jul 2014
Posts: 1,252
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
tds, it's a lot easier than it looks; the challenges are to remember that you'll probably need to shim one side of the motor as K documented and you need to really torque down the retainer nut on the bottom bracket (IMO). I was surprised that the PAS system set up so easily.
2old is offline  
Reply With Quote
Old 12-27-15, 11:46 AM
  #25  
K2AZ
Member
Thread Starter
 
Join Date: Dec 2015
Location: Glendale,AZ
Posts: 38

Bikes: K2 Attack 2.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm with 2OLD, it is a fun,not too hard project. The big thing with me was the cost ! And not being sure it worked like others said it did.

Here is the spacer / nut I made to take up the gap between the motor and the bracket. It's the silver part between the black stuff. You will ,maybe need 2 ? If their is no gap , you're good to go. And lots of BLUE Locktite.

K2AZ is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service