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Soma B-Side V.2 Belt Drive BBS02 750W/48V Custom Build

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  • Rider
    started a topic Soma B-Side V.2 Belt Drive BBS02 750W/48V Custom Build

    Soma B-Side V.2 Belt Drive BBS02 750W/48V Custom Build

    A few months ago I embarked on a ground up custom eMTB build after six months of riding a BBS01 350W/36V hardtail eMTB. I made many upgrades to that ride and got my feet wet in the E-bike world. Oh what a feeling they can provide!

    When I sold that E-bike I kept all the upgrades to put on my custom build that I knew I'd be doing at some point. Some of the upgrades included many 7000 series light weight parts such as: riser stem, handlebars, 42T Lekkie Bling Ring and pedals with titanium spindles. The cockpit got upgraded seat and Thudbuster as well as ergonic grips to fit my body and style of riding. I also invested in a set of Schwalbe Smart Sam Plus 27.5 X 2.25 E-bike Rated tires that really changed the way that eMTB performed off-road, but they are a little noisy on the pavement and like to grab everything in site with their traction.

    For the custom build I selected a Soma B-Side V.2 Belt Drive frame in large. I'm 6"2" with a 34" pants inseam and my old eMTB had a 21" XL frame that fit me very well, but what I didn't like about it was the 71* head tube angle. It worked fine for everything except steep declines. I only had one fall on that bike and I attribute part of it to the non-slack head tube angle; went over the bars on Rattle Snake in Crystal Cove State Park (has some steep rutted sections in it) and got bit by the snake. So I knew my next eMTB would have at least a 68*-69* head tube angle on it. The Soma B-Side met that requirement and a life long desire to own a Gates Carbon Drive bike. I went with the 18.5" large because it has a lower top tube so others can ride the bike too. I just make up for my size with a higher seat post and long riser stem with some sweet sweep-back bars for a comfortable position.


    When the frame arrived I was very impressed by the quality of it and the paint job. Note the belt drive frame break circled. That allows the installation of the belt that can't be split like a chain. The frame does require you to face and chase the BB, face and ream the head tube and ream the seat post tube (like most new frames). I took it to one of my well respected LBS shops for that to insure it was done right.

    Last edited by Rider; 06-25-2018, 09:03 AM.

  • Rider
    replied
    Originally posted by Ttreshh View Post
    Asking for some help:
    Building BBS02 with Nuvinci N380 on a belt drive...
    What pulley rings do I need?
    If you are putting a belt drive ring on a BBS02 you can’t go smaller than a 50T or it won’t clear the reduction gear. You have to do the calculations for the belt line yourself based on the rear hub you are using.

    Leave a comment:


  • Ttreshh
    replied
    Asking for some help:
    Building BBS02 with Nuvinci N380 on a belt drive...
    What pulley rings do I need?

    Leave a comment:


  • Rider
    replied
    Things change and life moves on... Now that my Sulry ECR is dialed in I ended up converting this Soma B-Side into my belt drive 3spd pedal city ripper and beach cruiser. It's so nice having that 33% lower and higher gear on both sides of the single speed gearing that Soma recommends. Get a headwind or hill that is taxing you, grab first. Get a tailwind or decent and want pick up speed, grab 3rd. Sweet! All in complete silence.

    I will be posting up my extra BBBS02B 750W 48V color display kit with full belt drive rings and adaptor, plus Avid BB7 brakes and rotors for $500 in the For Sale Parts section today.

    HERE'S A LINK TO IT:
    https://electricbike.com/forum/forum...-brakes-rotors

    Belt drives are sweet with E-assist or pedal.

    Cheers all!
    Attached Files
    Last edited by Rider; 09-15-2018, 09:26 AM.

    Leave a comment:


  • Rider
    commented on 's reply
    When you consider the cost of a Lekkie Bling Ring, the little extra cost to go Gates CDX belt drive isn’t that much if you shop on the net for the parts. The biggest issue is having the belt line straight. IMHO not having that right and using a BBSHD instead of a BBS02B is what caused the above belt ring adaptor to fail and maybe it’s weak designed inward offset.

  • Rider
    replied
    She's back on the road! Did a quick ride to the beach and back to test her new shoes and gearing out. Hit a nasty headwind all the way there (11+ miles) and it was sucking up 500-600 watts to keep it above 20mph. Although on the return it was only using 0-50 watts to keep it above 20mph; tailwinds are wonderful. Cruised about 2mph faster with the new gearing. Rode smooth, quiet and very soft ride with the 2.8/2.4 Schwalbe Super Moto-X combo front/rear. The belt drive is sweet.
    Attached Files
    Last edited by Rider; 06-28-2018, 06:09 PM.

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  • Rider
    replied
    Swapped out the 50T front sprocket for a 55T today. While the rear wheel was off I decided to swap tires once again. The WTB Byway 47c tires feel wonderful in a straight line on cement and all around on gravel roads and hardpack, but I'm turning this ride into more of a road only oriented city bike now. The WTB Byway knobby edge isn't the best for laying a bike down on the tires edge on cement and if you hit wet pavement with that knobby edge it has a tendency to slide out. The WTB Horizon is basically the same tire without the knobby edge, so I'd recommend that tire for a dedicated street ride over the WTB Byway, but I have other street tires already...

    I had a pair of Schwalbe Super Moto-X 27.5" X 2.8" tires on this bike at one time, but got a 1/4" slit cut in one that required a inside tire patch and there wasn't much clearance for a tire that big in the rear (it did fit though). I returned a Schwalbe Super Moto-X 2.8" to the front Halo Vapour i21 rim for street use. It measures just under 2.6" on this narrow rim. I ordered up a matching Greenguard E-rated 2.4" Schwalbe Super Moto-X for the rear to get better tire clearance with the tire moving forward some because of the new 55T beltring. When this ride hits the rode once again with a little higher gearing for more speed it will be sporting 2.4" in the rear and 2.8" up front; probably netting about <2.4" and <2.6" width; right in the sweet spot that many MTB riders are finding offer the best compromise of traction, control and feel.
    Last edited by Rider; 06-25-2018, 09:07 AM.

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  • Rider
    commented on 's reply
    Thanks SM. Hope to see more belt drive builds over time as methods of belt alignment are discovered. IIRC the expensive Rohloff IGH is still the widest belt line out there and is the easiest to match a front belt ring to. Someday I will own one. I’m sold on IGH hubs in general. The ability to shift without pedaling is so nice. I usually downshift while coasting up to a light or even after I come to a stop. You can’t do,that with a derailleur setup.

  • spinningmagnets
    replied
    Finally found a few hours to collect and format the info to publish this...[it still needs more links and other additions, but if I don't publish something now, I might never get to it...]

    http://www.electricbike.com/gates-belt-bbs02/

    Leave a comment:


  • Rider
    replied
    Cracked the 3,000 mile mark with today's ride to the beach. Definitely a biking weekend here in sunny SoCal. The bike trail was packed and so was the beach boardwalk through Long Beach. Did 37.5 miles and averaged a rather fast for me 17.1mph. Top speed was almost 30mph; 29.8mph. I got in a jousting match with a couple roadies that didn't like me passing them at a light. I was simply cruising at about 21mph and they were stopped, but the light turned green when I approached. I lost them for a couple miles, then they caught me when I was waiting at a light. As I took off and quickly got up to speed, one of them jetted past me while I was going 22mph. His friend hung back, but eventually passed me as well. They were working hard to hold it above 23mph. I caught them at a light and we all had to wait. This time they took off as hard as they could and tried to drop me. I just simply clicked up the power a bit and caught their tail in no time. They kept looking back, switching lead position and sweeting bullets; all the while all they hear is silence, then a clicking whur over and over. I was just pedaling a few rounds, then coasting right in their draft. It reminded me of last mile of "their" road race. They moved left then right, still trying to drop me. Ain't gonna happen! They picked up their pace even more to 26mph. I clicked my power up from level 7 to level 8 and road their rear tires with my insistant coast clicking. I could have passed them anytime I wanted. We all got caught at another light and I just sat back a couple bike lengths with my foot on the curb; in my plaid beach shorts, button short sleeved shirt and straw beach hat with sunglasses (they were Roadied out in areodynamic bike apparel - LOL). When it went green this time, they didn't push it. My turn was coming up in two streets, so once traffic was clear I went to level 9 and pumped past them and across the street at an angle. then took it up to about 30mph and held it there until my turn. Needless to say, they weren't anywhere near me on the other side of the street. I don't know if they knew I was electrified. My bike is silent and it looks like a belt drive single speed, but I'm guessing they saw the black motor down there. Certainly they didn't know it was a simple 3spd inside that little cassette hub on the rear wheel. It was all in good fun...

    The great thing is yesterday my 55T front belt drive ring arrived. That will add 5T to the front and more speed when desired. I can road this thing out a bit now that I have my Surly ECR build in the works for dirt roads and trail treks.

    TO MUCH FUN!!!
    Last edited by Rider; 06-03-2018, 03:43 PM.

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  • Rider
    replied
    Rejigged the Soma B-Side cockpit by returning the S-T Thudbuster and ISM Sport saddle, as the L-T Thudbuster and ISM Urbaine will move on to my new upcoming Surly ECR build. Added some narrow ~600mm Ritchey alloy flat bars off a early 1990's Schwinn Crosspoint I still have, but is now setup as a more upright hybrid commuter bike. Gloved it with the Ergon GP5 grips with ESI covered long bars ends that I was using as inner bars prior. The Fouriers Trailhead 35* sweep bars with two pairs of ESI Extra Chunky grips will go to the Surly ECR as well. I held off installing a new set of Tektro E350 Bafang cutoff hydraulic brakes and rotors on the Soma B-Side, as they will now go to the new Surly ECR. I cut off the ends of the Bafang manual levers attached to BB7 brakes to make them 2-3 finger levers, giving me more handlebar control while braking and further lever pull. The new setup fits this ride well, as it has become the closest thing I will ever own to a drop bar road bike again. The large comfortable ESI covered bar ends are just the right "old school" width for comfortable city ripping without as much of a possibility of catching a handlebar end on a pole, fence, wire, trashcan, bench, etc... that you have to maneuver around here when sidewalk hoping. Pictures are of the new setup. I'm still considering bumping the front belt ring up to a 55T to get a bit more speed out of the S-A 3spd IGH. Absolutely loving this bike and the way it has evolved over its' 3,000 mile life so far.
    Last edited by Rider; 05-25-2018, 03:06 PM.

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  • Rider
    commented on 's reply
    Yeah, I think the Gates 50T is the smallest front belt ring that will clear the gear reduction housing bump. Not to worry though, Gates makes some big rear belt cogs to make up for the extra teeth up front. If you have the money the Rholoff 14spd IGH hubs have a huge offset that works with a BBS02 too. Search for the "Surly ECR BBS02" build on this site.

    Here it is:
    https://electricbike.com/forum/forum...bs02-mid-drive
    Last edited by Rider; 03-19-2018, 03:13 PM.

  • freebike
    commented on 's reply
    rad! I see that you've installed the belt ring on the inside of the adapter/spider. I just got my french-made adapter in the mail this week. I mocked up a smaller CHAIN ring to the spider and it doesn't clear the screws and/or face place of the motor controller. really bummed about that. not sure what to do about the spacing... so rad that this project came together for you tho!

  • Rider
    commented on 's reply
    It sure looks like it:

    http://precialps.com/fr/accessoires-...s01-bbs02.html

    I bought it on eBay.

    This S-A 3spd Cassette setup has been working great for over 2,500 miles now. Did a quick ride today from Anaheim, CA to Seal Beach Pier and back in 1-1/2 hours. About 25 miles with average speed ~16.67mph. Current gearing is 50T X 24T. Now that this bike is a dedicated cement and hardpack dirt ride I'm considering going 55T up front. No worries what so ever regarding the Gates Carbon Drive belt. Best thing ever invented after IGH hubs!

  • freebike
    commented on 's reply
    Such a great build story, thanks for sharing!!! I was inspired before. and now I have even more confidence in a belt drive. is this spacer/spider/adapter the same on from the precialps web site?

    http://precialps.com/uk/accessories-...s01-bbs02.html
    Last edited by freebike; 03-07-2018, 04:30 PM.
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