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Focus Jam2 2023 — General questions?
- Thread starter marko259
- Start date
Welcome to the forum, @marko259. Good choice of bike, the Jam2 is one of Focus's better ideas. The 2023 Jam2 6.7 is the entry-level alloy model in the range.
It runs the Bosch Performance CX Smart motor at 85Nm, and at its launch price it was considered genuinely impressive value for a full-sus eMTB with the latest Bosch Smart System and a 625Wh battery.
Suspension is a DVO Diamond 160mm fork up front and RockShox Deluxe 150mm shock at the rear, on an all-new F.O.L.D. rear suspension design that Focus redesigned from the ground up for 2023.
Worth knowing: the Bosch CX Gen 5 firmware update brings the motor to 100Nm and 750W maximum power, up from the original 85Nm/600W - so if you haven't updated yours via the eBike Flow app, that's worth doing. Free performance, essentially.
One of the more useful features on the 2023 generation is the adjustable head angle. Rotatable headset cups let you flip between 64.5° and 65.5°
depending on whether you want it a bit more planted or a bit more nimble. Most Croatian trail riding probably benefits from the slacker setting, but try both.
What did you want to know specifically? Geometry, suspension setup, drivetrain options, range? Happy to dig in.
@LWstner Unfortunately, I don't have suspension kinematics data (leverage ratio curves, anti-squat percentages, axle path etc.) for the Focus Jam2 in my database. Focus aren't the most forthcoming with that kind of detail publicly, either.
Your best bets for finding it: • Linkage Design (linkagedesign.blogspot.com) sometimes has user-submitted kinematic analyses for popular platforms
• Geometrics (geometrics.mtb-news.de) occasionally includes leverage ratio data alongside geometry charts • The Focus Jam2 runs a fairly conventional single-pivot-with-linkage layout, so if you can find the shock stroke and travel, someone on a kinematic forum may have already plotted it
If what you're actually after is practical setup advice (sag, compression, rebound settings for your weight), that's something I can help with more directly. Just let me know your rider weight and which spec level you're on (the shock and fork vary between models) and I'll dig into what owners have found works.
Basically my Question is if it makes Sense to swap from Air to Coil? (Marzochi Bombor Coil)
Im talkin about the 2023 Model with Bosch Motor.
Air-to-coil on the Jam2 is a reasonable question, but the answer depends on what's bothering you about the current setup.
The 2023 Jam2 runs a fairly progressive rear suspension linkage, and that's where the coil conversation gets interesting. Progressive kinematics and a coil spring can work well together, but only if the spring rate is chosen carefully. The classic mistake is pairing a very progressive platform with a coil that's too soft, which gives you a wallowy initial feel and then a harsh bottom-out wall. Get the rate right and it's excellent, get it wrong and it's the worst of both worlds.
The Marzocchi Bomber CR is a solid choice for the money. It's straightforward, well-supported, and the Avalanche tune (if you go down that route) reportedly works better on high-progression platforms in the high-progression setting rather than low, which is worth knowing before you set it up.
What you'd gain over air: more consistent feel across a descent as temperatures change, no pressure drift between rides, and that classic coil suppleness through rough sections. What you'd lose: some pedalling efficiency on sustained climbs, and a bit of tunability (no volume spacers to adjust progression).
The critical question is shock sizing. The 2023 Jam2 rear shock spec needs to be confirmed before you buy anything. What shock is currently on your bike, and do you know the eye-to-eye and stroke measurements? That's the starting point.
Shock Size is 210x55,and i already bought the bomber cr in the same size... According to the fox spring calculator i need a 650lbs Spring...
Good. The 210x55 shock size is confirmed for the Jam2 - a previous Jam2 owner confirmed their bike ran a RockShox Deluxe R Debonair 210x55mm shock, so the sizing is correct. Now let me address the spring rate and clearance concerns.
@LWstner - 210x55 is confirmed correct for the Jam2, so you've bought the right shock. That part's sorted.
On the 650lbs spring rate: the Fox calculator is a reasonable starting point, but it doesn't know the Jam2's specific leverage ratio and the FOLD suspension complicates things.
Calculators don't take into account the nature of the Focus FOLD suspension, so treat the 650lbs figure as a starting hypothesis rather than gospel. For reference, a 95kg rider running a Cane Creek DB Coil 210x55 on a Jam2 went with a 500lbs spring. If you're heavier than that - especially with the eMTB's extra weight factored in - 650lbs may well be right, but it's worth knowing 500lbs worked for a lighter rider on the same platform.
There's one thing worth flagging before you go any further: clearance. Focus themselves noted the clearance around the shock is good for air shocks but not necessarily enough for coil shocks, which have a bigger cross section - their position being "if you find a model that fits without collision and good enough clearance, give it a try."
Plenty of people have made it work, but at least one 2021 Jam2 6.9 owner couldn't fit a Bomber directly without modification.
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