YT Jeffsy Primus | A Full Suspension Bike For The Young And Talented

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It makes sense that YT should launch a kids’ bike, given they’ve been scouting the world for new Young Talent. So here it is: the Jeffsy Primus.

There are two bikes in the range, one with 24 inch wheels, and one with 26 inch wheels – for riders 135-150cm and 145-160cm respectively. The 26in bike weights 14.2kg, and the 24in is 12.6kg.

The aluminium frame is equipped with a flip chip, altering the head angle between 65.5and 66 degrees. The rear shock has been custom tuned for lighter riders, and the build kit specced for smaller bodies. Despite their small size, they’ve been put through the same testing procedures as an adult YT bike.

Jeffsy Primus 24

  • Price: £1,588 / $1,999
  • Weight: 12.6kg

Jeffsy Primus 26

  • Price: £1,699 / $1899
  • Weight: 14.2kg

Markus Flossman, CEO of YT Industries says:

“We are not toying around with this bike. We wanted to create a real performance mountain bike for the Young Talent out there. Creating a bike of this sort has been something we have been eyeing up for some time. After developing the custom bike for Harry [Schofield, a young British rider] and seeing how well he got on with it we knew we were on the right path and it is great to see this project become a reality.”

Chris Hilton, Chief Technical Officer, says:

“We built this bike utilizing our JEFFSY all-mountain bike platform, but with the intent to allow people of smaller stature to enjoy riding mountain bikes. Still, the JEFFSY PRIMUS has the same maximum rider weight as our other mountain bikes, resulting in the fact that it isn’t necessarily limited to just small, light riders and certainly has the capability for real off-road use. We worked with a variety of smaller riders to help us understand the specific needs. People will find that the bike has an active suspension, with a nice progression that lets you push the bike hard and a geometry that’s comfortable at all speeds. Being a smaller rider should not mean you have to sacrifice on durability or quality.”

The press release reads:

This extremely playful performance bike has been developed with small shredders in mind and aims to enable them to go full send with their big buddies on the trails, while proving to be an excellent climber on the way back up. The JEFFSY PRIMUS JP 24 is spec’d with a mint Manitou Machete JUNIT fork with 130mm worth of travel and its rear counterpart the Manitou McLeod shock is custom tuned for light riders. High-end handlebars, grips, saddles and seat post all come from SDG and the 11-speed NX drivetrain from SRAM enables smooth gear changing. The SRAM Guide R brakes with 160mm rotors deliver the braking power to manage speed well before tight corners and come to a halt at the end of the trail to finish with a stoked fist bump with the riding buddies before heading back up again.

The JEFFSY PRIMUS JP 26 has been developed for slightly taller shredders looking to send it with their mates. Fit with a 140 mm Manitou Machete fork and RockShox Deluxe Select + rear shock this mountain bike is a mean machine. The 12-speed SX drivetrain from SRAM paired with SRAM Guide R breaks deliver high performance when it comes to shifting and braking. Handling the bike is a given thanks to ODI grips, E13 handlebars and the dropper post ‘YT Postman’ makes sure the SDG saddle is out of harm’s way, when riders hit the next downhill section. Both the JEFFSY PRIMUS JP 24 and 26 rely on MAXXIS Minion DHR II tires to deliver grip in any conditions. Talking of conditions, even the muddiest and wettest days can’t stand in the way of a good shred in the woods, thanks to both bikes boasting the same high-end tech features as the JEFFSY which enable easy maintenance such as the single sided hardware access and race-specific advanced sealing concept with double-sealed bearings which keep water and dirt at bay.

Harry, shredding

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Hannah Dobson

Managing Editor

I came to Singletrack having decided there must be more to life than meetings. I like all bikes, but especially unusual ones. More than bikes, I like what bikes do. I think that they link people and places; that cycling creates a connection between us and our environment; bikes create communities; deliver freedom; bring joy; and improve fitness. They're environmentally friendly and create friendly environments. I try to write about all these things in the hope that others might discover the joy of bikes too.

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