CTM Rocky Jump 26-inch junior mountain bike — simple gear changes for your first forest rides:

Key features

• Wheel size: 26 in
• Frame size: 14 in
• Suggested rider height: Approx. 135–155 cm
• Fork: Suntour XCE28 DS, 100 mm travel
• Drivetrain: Shimano 1 x 8
• Brakes: Hayes mechanical disc brakes
• Cranks: 165 mm

One shifter to get used to

Moving on to a mountain bike brings enough to learn. The Rocky Jump keeps gear changes simple: one chainring, one shifter and eight rear sprockets. The 32T chainring and 11–45T cassette give you a choice of ratios for climbing and flatter sections, without a front derailleur to operate.

For forest paths and easier trails

The 26 x 2.10-inch tyres and 100 mm Suntour fork suit the bike’s role as a junior MTB for forest paths, gravel and easier off-road routes. The fork helps take the edge off uneven ground. Choose routes within the bike’s intended use and the rider’s ability.

Hayes mechanical disc brakes use cables to operate the calipers. Have the lever reach and brakes adjusted for the rider, then test their operation before setting off. Use the 165 mm crank length and 680 mm bar width to compare the contact points with a bike the rider already knows.

Check the size in person

The 14-inch frame and 26-inch wheels are suggested for riders approximately 135–155 cm tall. Height is a starting point: also check standover clearance, saddle adjustment and whether the rider can steer and reach the controls comfortably.

CTM Rocky Jump 26-inch junior mountain bike — specifications:

Sizing, weight and other details:

• Wheel size: 26 in
• Suggested rider height: Approx. 135–155 cm
• Rider level: Beginner to intermediate

Frame:

• Frame size: 14 in
• Frame: Rocky JR, 6061 aluminium

Fork:

• Fork: Suntour XCE28 DS, 100 mm travel
• Fork wheel size: 26 in

Drivetrain:

• Drivetrain: Shimano 1 x 8
• Shifter: Shimano STEF5002, 8-speed
• Rear derailleur: Shimano ESSA RD-U2000
• Cassette: Shimano HG400/8, 11–45T

Brakes and controls:

• Brakes: Hayes mechanical disc brakes

Cranks:

• Cranks: 165 mm
• Chainset: Shimano FC-UT400, 32T

Wheels and rims:

• Rims: CTM GA18, 559 x 21, 32H

Tyres:

• Tyres: Zippering, 26 x 2.10 in

Hubs and guards:

• Hubs: CTM aluminium, 6-bolt disc mounting, quick-release, 32H

Pedals:

• Pedals: FP-873ZU

Chain:

• Chain: KMC Z8.3

Stem:

• Stem: CTM 7140, 45 mm

Handlebars:

• Bar: CTM N04M, 680 mm width, 1 in rise, 31.8 mm clamp

Headset:

• Headset: FSA NO.11P

Saddle and seatpost:

• Saddle: CTM
• Seatpost: CTM LCSP-3, 300 mm length, 31.6 mm diameter

Safety while riding

Riding, falls and impacts put loads through the bike and can damage components. No bike is indestructible: parts can wear out or become damaged. Check the frame, fork, bars, wheels, axles, cranks, pedals, brakes and bolted connections before every ride. Inspect the bike after a hard impact and stop riding if you find looseness, cracks or damage. Have any problem checked and repaired before riding again.

Wear a properly fitted helmet and suitable protective pads. Read our important information before buying and using a bike for assembly, servicing and riding checks.

Important information about your new bike

• Read the instructions and warranty supplied with the bike before riding.
• The bike is delivered approximately 90% assembled for shipping.
• Before the first ride, fit the pedals, saddle and handlebars, and the front wheel where required. Follow the assembly instructions and check all components.
• Have a professional bike workshop carry out a pre-ride inspection. This is a paid service; keep the receipt as proof for the manufacturer’s warranty and follow the warranty terms supplied with your bike.

The manufacturer’s warranty is separate from your statutory consumer rights. Continue to inspect and service the bike throughout its use.

Frame measurement guide:

This diagram explains the measurement labels. It is an illustration of a hardtail frame, not a drawing or geometry chart for this specific bike.