A Little More on the Side
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The author strikes the proud owner pose with the upgraded 1993 K1100RS / EML Speed 2000 on the Side A Little More More on the e Side not safely ride on a motorcycle. Both of L Building a hack to my specifications… our boys have loved riding in the side- car. The excitement of being dropped By Michael S. Currin, PhD #54532 Suzuki Hayabusa sidecar rigs ridden by of at preschool in a sidecar and getting some of the other gatherers. Obtaining everyone’s attention is an awesome feel- “Being at the right place at the right the horsepower levels that these other ing. Kids would line up at the fence to time” and “sometimes it’s who you bikes put out from my twelve year old see us arrive. know”, these two eternal truths came K-bike was probably out of the ques- Driving a sidecar has its own chal- together at the 2005 High Performance tion, so I was thinking about upgrading lenges and joys, different than a motor- Sidecar (HPS) Gathering in Maggie the handling. cycle, but just as much fun. Most Valley, North Carolina. For a long time I originally became interested in mornings it’s the sidecar rig that gets I had been thinking of upgrading my sidecars when my children came along. picked for the ride to work, leaving the 1993 K1100RS with EML Speed 2000 It seemed like a way to share motorcy- two wheelers in the barn. Even the old sidecar rig to better keep up with the cling with our two boys, especially since reliable R80/7 was sold since it never A Litt Yamaha FJRs, Honda Blackbirds, and our youngest has cerebral palsy and can seemed to get picked when it was time 56 BMW OWNERS NEWS August 2007 to ride. A couple months after I got the really go around a corner. It was a lot kit included a sub frame that ran under K1100 rig, my wife decided she was also faster than I ever would have expected. the K1100RS body work and tied to the interested in sidecars and an R80RT The Speed 2000 sidecar was high tech bike at the steering head, front motor with an EML Tour T sidecar showed up for its day. The installation kit featured a mounts, and at the transmission. This in the barn. Leading Link (LL) front end and 14 inch strengthened the bike frame for the When I began the sidecar search, I automotive wheels and tires for all three had never heard the words “sidecar” and wheels. The LL front end is better than “high performance” used in the same a traditional telescopic fork at handling The sidecar frame was modified paragraph, let alone same sentence. My the side force generated by a cornering to move the body four inches to original interest in the K1100RS / Speed sidecar. Also, it can be designed to use 1 the right to provide more room for the front suspension. Other frame 2000 was based on one picture sent to a much wider tire than would fit on the modifications were the addition of the me by the former BMW dealer in St. stock motorcycle front end. Automotive mount for the swing arm pivot and Louis. No mention was made of perfor- tires put a lot more rubber on the road extra bracing. mance; it just really looked good in the than conventional motorcycle tires and The bike side swing arm mount photo. since the rig does not lean there is no had to be designed to allow After reading some of the how-to- need for the rounded profile of motor- 2 clearance for the brake pedal ride-a-sidecar information, I was a cycle tires. The wider tires really make and to not block the oil sight glass. little worried about my first ride. I was a difference in the cornering and stop- The front swing arm was first pleasantly surprised at how well the rig ping capabilities of an HPS rig. tack welded together and all worked right out of the box. There was The leading link front end had less 3 alignments double checked. none of the pulling to the right or left trail than the original, making the Once the swing arm was that I was expecting and after a while steering easier. This is very important completed the front shock I started to find out how fast it could when running a 175-series car tire. The 4 mount was designed. 1 3 2 4 URRIN. C FINNEY AND MIKE MIKE AND FINNEY M OTOS BY JI BY OTOS H P August 2007 BMW OWNERS NEWS 57 sidecar duty and also included mounts forward pointing single sided swing The next thought was if the 175/75 x for the sidecar. arm. Properly designed, they are more 14 automotive tires that were originally Among the attendees at the Gath- rigid than either a standard or leading on the rig were good, 195/50 x 16 tires ering were Ruth Ann and David Han- link front end. Since all the compo- had to be better, plus it would be nice nigan, with one of their new Suzuki nents are on one side of the front end an to be able to use standard car rims; no Bandit 1200 Bandito sidecar rigs. The automotive style wheel can be mounted more looking for a shop that can or is Bandito is the first American-made using lug bolts. This makes removing willing to mount and balance a 14-inch sidecar setup to use Center Hub Steer- the wheel much easier. car tire on to a rim made to fit a motor- ing (CHS). Prior to this, if you wanted Also attending were Margie and Bill cycle front axle. If I’m making that leap, to experience the handling advantages Ballou. Bill is the designer and fabrica- I might as well make all three wheels of this caliber of a rig you had to import tor of the CHS front suspension used capable of using the same rims and a sidecar from Europe, an expensive on the Hannigan Bandito and K1200RS tires. So now I’m looking at a new hub and time consuming process or build sidecar rigs. After some discussion, I to mount an automotive rim on the rear your own. Hannigan has now added a learned that the prototype for the Ban- of the motorcycle, and also changes to CHS sidecar for BMW K1200 RS. dito hub was still lying around Bill’s the sidecar hub. Center-hub steering has many advan- machine shop and could be purchased After a few days of sitting and star- tages for sidecar use. One is the reduced for a suitably sized stack of cash. The ing at the rig, I had a basic concept of camber change when turning, in other only problem was there was no swing for my new front suspension. Instead of words, the front tire stays flatter to the arm. I would be on my own to design the short swing arm, pivoting in front ground, keeping more rubber on the and fabricate everything between the of the radiator and going forward to the road. With a telescopic or LL front end hub and the rig. front hub, as used on the Hannigan rigs, the tire rolls up on its edge when turn- This started the wheels turning. A I would use a long swing arm, pivoting ing. The static friction can be greatly few years prior, I had added a sway bar between the bike and sidecar. There were reduced, improving the ride and road connecting the sidecar suspension and several reasons for this. First, it would handling ability. Also the front end can the rear-wheel suspension, so I figured reduce the amount of caster change be designed to have adjustable caster it couldn’t be that much more work as the front end moved up and down on the (trail)Side going from quick steering for the to add a new front end. (I have been through its suspension travel, second it twisties to slower steering for greater known to occasionally underestimate would put less material in front of the stability on the interstate. the time and effort required to complete radiator on a bike that already tended to The CHS designs looks a lot like a a project). run a little hot, and third it looked like 6 More 5 e L 7 A Litt 58 BMW OWNERS NEWS August 2007 something I could build. rotor and two 6 piston brake calipers slightly to the left so the tire would Pivoting the front-end swing arm from a Suzuki Bandit 1200. After about clear the rear suspension. After look- between the sidecar frame and the EML six months of Sunday afternoons in ing at many wheels, both aftermarket sub frame that had been part of the the barn with the Harbor Freight pipe and OEM, I decided to use stock Mini original sidecar kit meant that it would bender, I had a forward-facing swing Cooper wheels. They were the narrow- no longer be possible to adjust the side- arm pivoting on tapered roller bearing est 16-inch wheels I could find, looked car wheel toe in and bike lean out by on a ¾- inch shaft between the bike and good, and plus they’re akin to BMWs. adjusting the sidecar mounts. So I now sidecar. I took one of the Mini Cooper hub caps had to redesign the sidecar wheel hub Then I had an adapter made to to the local BMW shop, where the parts to be adjustable for toe in, ride height, have the same lug bolt pattern on the man helped me find some BMW roun- and camber.