ABOUT US
Robbie Cadwallader
Motocharities and The Scotts Valley Motorcycle Show is the brainchild of motorcycle racer and enthusiast Robbie Cadwallader. The event has emerged from Robbie's previous show, Moto Espana, also held in Scotts Valley, California.
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“I started riding Bultacos when I was 13 years old. I raced them at all the local tracks, including Salinas, Fremont, and Hayward. I’ve been a Bultaco enthusiast for many years. I buy them in various conditions, restore them, and ride them. Moto Espana was originally an all-Spanish bikes show until Moto Espana 3 when we invited all vintage bikes to attend. This year we're taking the show and our giving to a whole new level.
A fascination with speed came at an early age for this Santa Cruz, California native. Robbie first started racing motorcycles at the age of 15 on a Bultaco 200 Sherpa S scrambler. Back then, there were multiple racetracks in the Bay Area to choose from, Hayward, Fremont, Salinas, and Lodi. Robbie gained a novice license and quickly moved through the ranks to expert classification. After a military stint, Robbie got back to racing, this time in a formula race car from 1979-1982. Go-kart road racing was next, and in 1987 won the coveted Troy Rutman Memorial Award. Water sports came next with vintage drag boat racing, and in 1992 Robbie earned a final spot in top elimination at Lake Ming in Bakersfield. The water evaporated to asphalt, and Robbie became rookie of the year at Madera Speedway in the NASCAR Grand American Division, but motorcycles were still an alluring hobby, particularly the Bultaco brand. After several top Bultaco restorations and a one-off race on the famed Catalina Red Bull Grand Prix, Robbie decided to do motorcycle shows. After completing three shows, Robbie felt it was time for a new project, and the Scotts Valley Motorcycle Concours was born.
Motocharities was formed as the organizing body. Our mission is to provide motorcycle and automotive entertainment to benefit local communities. Most of the proceeds are donated to the Scotts Valley Kiwanis Club specifically to support music and sports programs in the local schools. I’m proud to collaborate with friends to bring this event to reality.
See you at the next show,
RC
MAKE IT HAPPENERS
Clay Baker - Tech & Finance/Sponsor
Clay Baker is the owner of Motonexus, an online motorcycle auction platform, and co-sponsor of the Scotts Valley Motorcycle Show. Motonexus is free for sellers and one of the lowest-cost auction sites for buyers. Clay is responsible for the Scotts Valley Motorcycle Show website, financial reports, and payment processing system. Clay's riding began around age 10, disobeying parental 'no-motorbikes' orders and sneaking rides on friends' mini bikes. In high school, riding took him off-road on a friend's YZ400 on Oahu's military reserve. In college Clay road various bikes, but a Honda 750 Four became his steady ride from the MSU campus in Bozeman on many trips through Yellowstone Park. Clay is an avid motorcycle rider, collector, and restorer. In his day job, Clay is a stock analyst and portfolio manager at Crystal Waters Capital, a hedge fund in San Jose and Oakland, California.
On Friday, July 18, 2025, Clay will be the featured speaker at the AMCA Waseon National Meet in Waseon, Ohio at the Fulton County Fairgrounds where he will be talking about estate planning for motorcycle collections.
Allen Siekman - Head Judge
Allen caught the motorcycle bug early in life. Too bad that his parents would not let him have one! At age 14, he could be found riding his friend’s bikes all over the back streets and country roads around Grand Junction, Colorado. He got his first bike and made his first long-distance road trip in the fall of 1966 after he graduated from high school. He decided riding a 90cc Honda C200 from Denver to California was a perfectly good idea. He was 18, and while technically not running away from home, he was on his way to new adventures and never returned. He survived that journey and now, at age 77, still rides, restores, and races motorcycles.
Allen is passionate about historically significant motorcycles. Although he specializes in Japanese bikes, he is often asked to help locate bikes or components for a broad spectrum of machines. His restorations have been featured in several magazines. Allen has been judging motorcycle shows for nearly 50 years. He worked with the AMA, running their shows at Vintage Motorcycle Days in Ohio and other locations nationwide. He is an Antique Motorcycle Club of America (AMCA) judge and the Assistant Head Judge at The Quail.
Allen started building and racing vintage road race motorcycles 11 years ago. He is a member of the American Historic Racing Motorcycle Association (AHRMA) and races in the CB160, GP200, and GP500 classes. He often hauls his race bikes to tracks in the back of his restored 1951 Studebaker truck. He does most of his work, such as bike prep and machining the one-off items he may need. Unless he is out riding, Allen can be found in his shop.
Mike Van Lienden - Announcer
Mike discovered motorcycling in high school and while working in a local motorcycle shop cleaning bikes and changing oil. That led to a career as a mechanic, working on a wide variety of motorcycles. In the eighties he worked on cars and then moved on to Fox Racing Shox, doing shock tuning and repairs at national and World Cup mountain bike races.
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Mike's street riding moved to off-road riding at a local quarry and exposed him to local racers, eventually earning an amateur racing license and moving up the ranks in one of the most competitive AMA districts in the country. Mike earned four of the coveted “black plates”, denoting him as one of the top twenty experts in the district. Mike has competed in dirt track, trials, road racing, hillclimb, and motocross events.
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Mike took up 'event announcing' specializing in bike shows and small group emcee events. Mike's work on many different models in various shops provides him with a unique knowledge of the different models and their significance within the motorcycle world. Now retired, Mike spends time riding his bicycles, leading an occasional group motorcycle ride, and is currently restoring a pair of mid-fifties MV Agusta motorcycles.