Specialized Sirrus Build Thread (BBS02 750w Kit)
- Thread starter xenon
- Start date
flymeaway
Well-Known Member
Yup...now it's time to have fun! The conversion does the same for a tandem.....and is the way to go converting a tandem.
Court J.
xenon
Member
Pretty minor leap of faith compared to when I purchased a $55,000 wakeboard boat without having any wakeboarding experience. I knew I would love it. I ended up having the boat for 5 years and used it allot.
I spent a few hours today getting familiar with the custom settings. I was able to increase the levels of pedal assist to 9 and I also dialed in my wheel size so that the speedometer would match my GPS. With the 38T spider on the front, I was maxing out at 48km/h. I am going to swap back to the stock 44T spider to feel the difference and decide what version to stick with. Not too many hills in my area so the stock spider may not be over-geared for my use.
Another thought I had today was that I may have chosen the wrong bike to install this kit onto. The bike paths near me have some age to them and are not very smooth. It makes for a harsh ride and I am not getting any younger. A decision might be made to sell the bike I just bought and install this kit onto something with suspension. The full suspension bikes dont seem to have a whole lot of room for the battery so I may go with a front suspension frame and thudbuster seat post.
I spent a few hours today getting familiar with the custom settings. I was able to increase the levels of pedal assist to 9 and I also dialed in my wheel size so that the speedometer would match my GPS. With the 38T spider on the front, I was maxing out at 48km/h. I am going to swap back to the stock 44T spider to feel the difference and decide what version to stick with. Not too many hills in my area so the stock spider may not be over-geared for my use.
Another thought I had today was that I may have chosen the wrong bike to install this kit onto. The bike paths near me have some age to them and are not very smooth. It makes for a harsh ride and I am not getting any younger. A decision might be made to sell the bike I just bought and install this kit onto something with suspension. The full suspension bikes dont seem to have a whole lot of room for the battery so I may go with a front suspension frame and thudbuster seat post.
flymeaway
Well-Known Member
I'll wager your bike paths are probably smoother then the roads I ride on in New Hampshire
My 36V 500W Bafang mid-drive conversion was done to a BD Motobecane Hybrid with suspension forks, it does help smoth out the ride. That bike has over 2,000 miles ridden and they aren't particularly gentle miles. Couple of minor issues but so far so good.George is converting the same bike with front hub drive.
Court J.
George S.
Well-Known Member
I live on a dirt road. A couple of years ago I bought the BikesDirect bike that Court also has. No cycling for the 15 years prior. I thought the rough roads were too much. Now, it's just something to put up with. I put up with colder temperatures and more wind, as well. I wouldn't throw money at anything until you give it a while to sort out. Short sections of wash board are bearable if I just stand off the seat, which is easy with a throttle to keep the bike moving forward.
I have the front suspension fork, but I guess that is not recommended for a front hub motor. They can be brittle, and the front hubs put additional stress on the dropouts. I've got a torque arm on it, but I might look for a steel fork, no suspension.
These days when I look at any bike I just seem to thing "Gee, which motor would I put on that". The rear hub motor on the bike in this video does OK on hills, but this is about the limit, and it is 750 watts. Sometimes I go looking for rough roads, so I know I've crossed some kind of line.
It would be fun to have a mid-drive.
I have the front suspension fork, but I guess that is not recommended for a front hub motor. They can be brittle, and the front hubs put additional stress on the dropouts. I've got a torque arm on it, but I might look for a steel fork, no suspension.
These days when I look at any bike I just seem to thing "Gee, which motor would I put on that". The rear hub motor on the bike in this video does OK on hills, but this is about the limit, and it is 750 watts. Sometimes I go looking for rough roads, so I know I've crossed some kind of line.
It would be fun to have a mid-drive.
Ravi Kempaiah
Well-Known Member
- Region
- Canada
- City
- Halifax
I had a blast on FSP Giant at the Interbike. FSP do have enough room for bottle cage battery. This is what I rode at the Interbike. It was super torquey, I mean I was doing small wheelies.
xenon
Member
I would LOVE a full suspension bike to pair up with the BBS02 but an entry level Giant Anthem is $2500 CAD. A bit out of my reach at the moment.
I am currently looking at Specialized Hardrock, Specialized Pitch 650B and Specialized Rockhopper. All 3 models are under $1K. With a thudbuster seat post, it should be all I need.
I am currently looking at Specialized Hardrock, Specialized Pitch 650B and Specialized Rockhopper. All 3 models are under $1K. With a thudbuster seat post, it should be all I need.
xenon
Member
I solved the bottom bracket issue after discovering this image:
(Link Removed - No Longer Exists)
Dropped into my local hardware store and picked up the necessary hardware. I also got some LocTite to put onto the thread of the nut holding the crank in place.
The BBS02 install is complete on the new bike. Now I need to convert the rear gears on this bike from 7-speed to 9-speed.
(Link Removed - No Longer Exists)
Dropped into my local hardware store and picked up the necessary hardware. I also got some LocTite to put onto the thread of the nut holding the crank in place.
The BBS02 install is complete on the new bike. Now I need to convert the rear gears on this bike from 7-speed to 9-speed.
xenon
Member
Quick question for you guys. I am far from a bike expert so I am a little puzzled by my issue.
To convert the rear cassette from 7-speed to 9-speed I need the following: 9-speed cassette, 9-speed trigger shifter, 9-speed rear derailleur, 9-speed chain. Correct?
Do I also need to replace my rear wheel hub? The reason I ask is because I purchased everything above and there is not enough room on the hub to install the 9-speed cassette...
Picture of hub:
(Link Removed - No Longer Exists)
To convert the rear cassette from 7-speed to 9-speed I need the following: 9-speed cassette, 9-speed trigger shifter, 9-speed rear derailleur, 9-speed chain. Correct?
Do I also need to replace my rear wheel hub? The reason I ask is because I purchased everything above and there is not enough room on the hub to install the 9-speed cassette...
Picture of hub:
(Link Removed - No Longer Exists)
Last edited:
J.R.
Well-Known Member
- Region
- USA
- City
- Piedmont Highlands
Nice build!
Not so fast....
Answer to the "quick question" is maybe, should work most of the time going up from 7 to 9, but not always. The question would have to include a whole lot more information and the answer still might be, should work.Best thing to do is go to a real source: Sheldon Brown cassettes
Good luck
xenon
Member
Nice build!
Not so fast....
Best thing to do is go to a real source: Sheldon Brown cassettes
Good luck
Nice resource!
I skimmed thru the website quickly and found this little gem:
"Any 7-speed Shimano Hyperglide Freehub will actually work with 8 or 9 sprockets, without any modification! What you need to do is to use 8 of the sprockets from a 9-speed cassette, with the 9-speed spacers -- or 9 of the sprockets from a 10-speed cassette. This trick also is useful when cassette body transplantation isn't possible -- on an off-brand hub or a Sachs 3 x 7 hybrid-gearing hub.
xenon
Member
I might just ditch the 9-speed conversion and get a 7-speed shifter with this rear cassette:
http://california-ebike.com/product/shimano-7-speed-freewheel-14-34-megarange/
http://california-ebike.com/product/shimano-7-speed-freewheel-14-34-megarange/
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