{"product_id":"bmc-twostroke-al-20-bike","title":"BMC Twostroke AL 20 Bike","description":"\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eBMC Twostroke AL 20 Bike\u003c\/strong\u003e is a youth mountain bike built for riders roughly 3'7\" to 4'5\" tall, generally ages 5 to 8, and it's designed as a real scaled-down mountain bike rather than a toy with knobby tires bolted on. BMC built the Twostroke AL frame and fork specifically around a 20\" wheel platform, which means the geometry, reach, and component sizing are proportioned for a young rider's body rather than shrunk down from an adult frame.\u003c\/p\u003e\n\n\u003cp\u003eThe frame and fork are both lightweight aluminum with a powder coat finish, and the complete bike comes in at a claimed 8.6kg without pedals — light enough that a smaller rider can actually maneuver it, pick it up, and haul it over an obstacle without fighting the bike's own weight. BMC rates the frame to ASTM Level 3, a classification aimed at more capable young riders tackling moderate off-road terrain and small jumps rather than just paved paths, and the tire clearance is generous enough to run the stock 2.4\" tires with room to spare.\u003c\/p\u003e\n\n\u003cp\u003eThe cockpit is where the kid-specific thinking really shows. A 650mm handlebar with a 35mm stem keeps the front end narrow and manageable rather than wide and twitchy, and the Tektro HD-M286 hydraulic disc brakes use short-reach levers sized for smaller hands, so a young rider can actually get a full finger wrap and modulate braking rather than grabbing for a lever built for an adult's reach. An SDG Fly Jr saddle and a 27.2mm alloy seatpost round out a cockpit built to fit rather than adjusted down from a bigger bike's parts bin.\u003c\/p\u003e\n\n\u003cp\u003eDrivetrain-wise, BMC kept things simple with a 1x8 SRAM X4 setup, running a Sunrace 11-34T cassette that gives a wide enough gear range for climbing without adding the complexity of a second chainring a young rider doesn't need to manage. The alloy hubs use sealed bearings and quick-release axles, and DD32 rims are laced up to carry Kenda Booster 2.4\" tires, which add real stability and traction on loose or rocky ground without requiring the higher pressures a narrower tire would need. That extra tire volume also forgives a less-than-perfect line choice, which matters for a rider still building trail confidence.\u003c\/p\u003e\n\n\u003cp\u003eAt $591, the Twostroke AL 20 is built for a family looking for their child's first real mountain bike rather than a low-cost bike-shaped object — one with hydraulic brakes, wide stable tires, and a wide-range drivetrain that can genuinely handle a dirt trail, not just a driveway. It's available in Poison Green\/Black and Turquoise\/Black, in one size fit for its target age and height range.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BMC","offers":[{"title":"Poison Green \/ Black \/ One Size","offer_id":43652145938476,"sku":"30001130","price":591.0,"currency_code":"USD","in_stock":true},{"title":"Turquoise \/ Black \/ One Size","offer_id":44030900240428,"sku":"30001131","price":591.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/bmc-twostroke-al-20-bike-8956442.jpg?v=1771302013","url":"https:\/\/ricycles.com\/products\/bmc-twostroke-al-20-bike","provider":"RA Cycles","version":"1.0","type":"link"}