New Jersey-based bike maker Jamis this week launched a line of alloy enduro mountain bikes. The new 27.5″ Defcon series rigs are built around a 160mm suspension platform that’s geared toward riding the highly technical East Coast trails nearby company headquarters, explained Jamis MTB product manager Sal Crochiola, of a bike that was two years in development.
The trio of bikes utilize Jamis’ mp4 suspension system, where the leverage exerted is progressive, which according to Jamis, allows the rear shock to be tuned more linearly for a smoother, more plush ride without bottoming. This also results in a more sensitive, active and tunable ride with stable pedaling efficiency. Because the rear shock can be pumped to lower air pressures without performance detriment, shock and seal life are improved and a greater range of adjustability is available, adds Jamis.
“We’re big proponents of actually getting out on your bike, riding more and spending less time fiddling with your suspension to get it working right,” added Crochiola. “We’ve spent years refining our pivot placement and stripping complexity out of our suspension designs to allow the shocks to do their job separately.”
Other key metrics include short’ish 17.1″ chainstays, a 66.5-degree head tube angle, and a wheelbase that ranges from 1126mm to 1191mm depending on size. The bike comes in 15″, 17″ 19″ and 21″ versions.
The new bikes all come spec’d with dropper posts and feature oversized chainstays that are asymmetrical, with an elevated straight stay on the non-drive side and a dropped curved stay on the drive side. The drive side must be dropped and curved to clear the front derailleur and chain, but running the non-drive side straight from the drop-out to the BB pivot is designed to reduce weight while stiffening the rear triangle laterally. There’s more tire clearance too.
Here’s a little teaser video of the new bike (definitely not filmed in New Jersey). Head over to page 2 for full specs and pricing.