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Opus Thumper

Opus Thumper
  • Color: Mirror Green
Mirror Green


For real mountain bike performance, the Bolt and Thumper are bang on! Their aluminum frames and quality components will satisfy every kid’s taste for dirt. With their 50mm of travel — more than most! — the Spinner forks offer real damping performance. Plus, their stable geometry ensures these bikes are easy and safe to ride. Even the cranks and saddles are sized specifically for 20” bikes, so you know the fit is as good as the ride.

- 50 mm Spinner fork has more travel and better damping for real trail performance
- Double-wall alloy rims and Kenda Smallblock 8 tires are light, tough and durable
- Youth-sized components deliver on fit and safety


Frame Opus 6061 Aluminum
Fork Spinner Grind 50 mm
Headset VP Semi-Integrated
Rims/Wheels Alex ACE 20
Hubs Joytech
Tires Kenda Smallblock Eight 20 x 1.75
Crankset Samox Alloy 127 mm
Chainrings 36
Bottom Bracket 5 pc Steel
Chain KMC Z51
Rear Derailleur SRAM X3
Cassette/Rear Cogs Shimano Tourney 14-34
Shifters SRAM 3.0 Twist 7
Handlebars Opus Junior 25.4
Tape/Grips Opus Kraton
Stem Promax 60 mm 15°
Brake Levers Tektro Alloy
Brakes Tektro V-Brake
Pedals Wellgo Resin
Saddle Opus Junior
Seat Post Opus Junior 27.2 x 300

* Subject to change without notice.

Part Numbers

Option UPC MPN
Mirror Green 624316022206 OP-THU18