Move to Bosch means revised linkage to ensure peak performance

By Tom Marvin

Published: Tuesday, 01 October 2024 at 07:01 AM


The new Santa Cruz Vala eMTB marks a significant departure from its range, ditching its signature VPP (virtual pivot point) linkage in favour of a 4-bar linkage to provide 150mm of rear wheel travel.

The shift in suspension linkage is all to do with packaging.

The new bike uses Bosch’s updated full-power Performance Line CX motor (which has brought a raft of new electric mountain bikes to market).

Fitting this into a frame that offered the ride characteristics and geometry the brand wanted meant Santa Cruz had to do away with its VPP links.

The Vala is built for rough and ready trail riding, with 150mm suspension at the back and 160mm travel forks.

Mullet (MX) wheels boost handling, while a 600Wh battery is said to blend range with weight distribution. Geometry and suspension progression chips are added.

Repackaging the frame

The iconic VPP design has been swapped for a Horst-link design to help Santa Cruz fit a Bosch motor to their ebikes. Tommy Wilkinson / Santa Cruz

Virtually every other full-suspension Santa Cruz uses its VPP linkage whereby two counter-rotating links low in the frame drive the shock.

However, the Bosch motor doesn’t easily sit with this lower linkage design, as the pivot would have to bolt through the motor body – not something that’s going to work very well…

In order to fit the motor, Santa Cruz has shifted to a more ‘traditional’ 4-bar Horst linkage on the Vala, enabling the motor to fit, while also ensuring it could use the geometry it wanted.

This shift has also enabled Santa Cruz to fit proper long-drop dropper posts into the frame.

Neat chassis details

Santa Cruz Vala Full Suspension Mountain eBike
Its tubes are relatively skinny for a full power ebike. Tommy Wilkinson / Santa Cruz

As you’d expect, the frame is carbon, with the brand offering builds with both its cheaper ‘C’ level carbon, and the higher-modulus, lighter and more expensive ‘CC’ carbon.

The frames have all the usual Santa Cruz accoutrements, including simple-to-service large bearings.

These require just a 5mm hex key to do a bolt check, with collet axles designed to resist them ever coming loose.

The link is bridged to boost stiffness and protect the shock from side loads. The captive flip-chip hardware means bits won’t fall on the floor when you adjust it, and replaceable thread inserts so you don’t write off your frame if you’re a bit ham-fisted.

And, there’s plenty of protection and bolted tool storage under the top-tube.

Numbers matter

Santa Cruz Vala Full Suspension Mountain eBike
“Vala” means ‘chosen one’, according to Google. Tommy Wilkinson / Santa Cruz

The kinematics of a bike is what, in theory, determines how it should ride.

The three graphs commonly seen cover anti-squat, anti-ride and leverage.

Anti-squat determines how much pedal forces stiffen up suspension – you want some, as this resists pedal bob, but too much can lead to a harsh and bumpy ride.

The Vala has moderately low levels of anti-squat, in keeping with what Santa Cruz is doing across its range.

With a motor to help on the climbs, a little more pedal bob, but potentially quite a bit more grip is a compromise worth making.

Santa Cruz Vala Full Suspension Mountain eBike
The chain slap protection is impressive. Tommy Wilkinson / Santa Cruz

At the sag point, the anti-squat is just above 100 per cent, so the suspension should be stable, while still allowing the rear wheel to track the ground.

It falls below 100 per cent later in the stroke, so bigger hits shouldn’t result in too much pedal kickback.

Anti-rise refers to how much the rear suspension squats under braking. Too much will make the rear suspension stiffen and the wheel skip over the ground, rather than allowing the tyre to stay in contact – handy for slowing you down.

You want some, though, to help counteract the natural forward shift of your weight under braking.

The figures are low on the Vala, and rise, slightly, through the bike’s travel, but remains well under 100 per cent throughout. As such, the Vala should provide excellent braking performance.

Santa Cruz Vala Full Suspension Mountain eBike
The chainstay to rocker link pivot has a geometry adjusting flip chip. Tommy Wilkinson / Santa Cruz

Leverage curves refer to the amount of rear wheel travel provided by each unit of shock stroke used.

When it comes to leverage curves, Santa Cruz hasn’t changes much compared to its current bikes.

However, the shift to a 4-bar linkage has enabled longer stroke shocks to be fitted. This means that the leverage ratios have decreased, though.

Santa Cruz say this gives better better damping quality and more consistency on long descents, as more of the shock stroke’s travel is used for any given rear wheel movement.

There’s also a progression chip fitted at the base of the shock.

Santa Cruz Vala Full Suspension Mountain eBike
The lower shock mount features a progression adjusting flip chip. Tommy Wilkinson / Santa Cruz

This gives the bike more or less progression over the range of its travel.

The less progressive setting will give a perkier, stiffer initial part of the suspension stroke, with slightly improved pedalling performance.

The more progressive setting will be softer and more supple in the early part of the travel, giving more grip and comfort.

The Vala will offer 26 per cent or 29 per cent progression.

Fine figures

Three quarter pack shot of the Santa Cruz Vala Full Suspension Mountain eBike
The Vala is the first Santa Cruz bike to use a Horst-link rear suspension system. Tommy Wilkinson / Santa Cruz

The geometry flip-chip offers two options – Hi and Lo.

They alter the head and seat tube angles by 0.3 degrees and the bottom bracket height by 4mm – the Hi setting being steeper and taller.

There’s also a roughly 3mm change in reach, with the Hi offering a slightly longer position on the bike.

In the Lo setting, a large has a 477mm reach, 63.9 degree head angle and a 77.2 degree seat tube angle – these are all in keeping with modern trends for a bike of this ilk.

Santa Cruz has maintained its offering of size specific chainstay lengths, ranging from 440mm to 451mm in the Lo setting, across the Small to XXL size range.


SMLXLXXL
Seat tube angle (degrees)77.277.277.277.277.2
Head tube angle (degrees)63.963.963.963.963.9
Chainstay (mm)440441444447451
Seat tube (mm)380400420460500
Top tube (mm)574602623646675
Head tube (mm)110120130145160
Bottom bracket height (mm)340340340340340
Wheelbase (mm)12111242126912981334
Stack (mm)626636644657671
Reach (mm)432456477497522


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Santa Cruz motor and battery specs

Santa Cruz Vala Full Suspension Mountain eBike
Bosch’s newest Performance Line CX motor with 600Wh batter is fitted. Tommy Wilkinson / Santa Cruz

The Vala is built around the new Bosch Performance Line CX motor.

It’s a full-power motor, offering 85Nm of torque and 600W of peak power. The unit has a claimed weight of 2.8kg – almost identical to the Shimano EP801 motor.

The motor has four standard modes, which can be customised in an app, with the on-bar mode controller being wireless. There’s a top-tube display to show battery range and mode.

This is paired with a 600Wh battery, stowed in the downtube, and fixed in place. This helps keep weight down, and should contribute to a quieter bike.

600Wh is said to be as much as most riders need, and helps keep the overall weight of the battery lower in the frame when compared to the 800Wh batteries that extend all the way to the top of the downtube.

If more range is needed, then Bosch’s 250Wh PowerMore range extender can be fitted.

Santa Cruz Vala CC X0 AXS RSV initial ride impressions

Male rider in orange top riding the Santa Cruz Vala Full Suspension Mountain eBike
It’s got an easy-to-ride quality that makes jumping on it fun and rewarding. Tommy Wilkinson / Santa Cruz

Senior technical editor Alex Evans was hand-delivered a brand new Vala ahead of the launch. He managed to do two rides on the bike on his home trails in Scotland’s Tweed Valley before the embargo lifted, and his initial ride impressions are below.

Hopping onto the Vala for the first time reveals a comfortably balanced ride feel – with little adjustment, I felt at home.

There’s an unbiased seated riding position. The steep seat tube angle places your hips comfortably over the bottom bracket but doesn’t transfer too much of your weight into your hands on flatter blasts along fire roads.

The new Horst-link suspension feels smooth and supple. It offers plenty of geometry-stabilising progression (even in the lowest 26 per cent flip chip position) to preserve your riding position and resist excessive sag when gradients really steepen.

Male rider in red top riding the Santa Cruz Vala Full Suspension Mountain eBike
On the climbs, the Vala feels comfortable and stable. Tommy Wilkinson / Santa Cruz

Comfort, control and composure are all well within your grasp, which really doubles down on the bike’s familiar feel.

The new Bosch Performance Line CX motor’s power, torque, and assistance mapping felt identical to the previous model, which is no bad thing given the brand’s class-leading position.

However, the freewheel rattle when descending on rough terrain has been totally eliminated. Combine that with the finned chain slap protection, and the Vala is eerily quiet downhill.

Male rider in red top riding the Santa Cruz Vala Full Suspension Mountain eBike
The front and rear suspension is well-matched. Tommy Wilkinson / Santa Cruz

Suspension performance is excellent, absorbing small stutter bumps and large compressions with absolute conviction. To boot, the rear end’s Fox Float X shock and Fox 38 GRIP X2 fork felt incredibly well matched.

Its balanced feel comes into play when descending – sitting neutrally in the bike’s centre makes overweighting either end less likely.

Control is delivered directly into the palms of your hands – you don’t have to work hard to keep the Vala on track.

Alex is going to be spending more time on the Vala over the coming weeks so keep tuned for a full review soon.

Santa Cruz Vala models and pricing

Santa Cruz Vala Full Suspension Mountain eBike
The Horst-link suspension design is used by many other manufacturers thanks to its tubeability. Tommy Wilkinson / Santa Cruz

Five models will be offered in the Vala, with the top two featuring its higher-spec CC carbon.

All bikes feature Fox Float X shocks, and all bar the base ‘R’ model have Fox 38 forks.

Schwalbe’s new Radial Casing Magic Mary tyres feature on all models, too.

We’ll add US pricing as soon as we have it.

Santa Cruz Vala R

The base model Vala receives the ‘C’ level carbon, along with a 160mm travel RockShox ZEB Base fork and Performance level Float X shock from Fox.

SRAM’s NX Eagle mechanical drivetrain is paired with their DB8 brakes with 220/200mm rotors.

Alloy Reserve 30|HD wheels are supplied.

  • £6,699

Santa Cruz Vala S

Next in the range is the ‘R’ model, with upgrades to suspension and drivetrain.

A Fox 38 Performance fork greets the Float X Performance shock, while there’s now a GX mechanical drivetrain.

SRAM’s Maven brakes feature here, as does a OneUp V3 dropper and RaceFace ARC30 wheels.

  • £7,599

Santa Cruz Vala GX AXS

As the name suggests, this middle-tier model gets electronic gears from SRAM’s GX AXS Transmission family.

There’s also Performance Elite level suspension at both ends and the same ARC 30 wheels from RaceFace.

  • £8,599

Santa Cruz Vala X0 AXS RSV

The second-best model sees Kashima gold featured in the Factory level fork and shock, and as the name suggests, SRAM’s X0 AXS Transmission gears.

There’s SRAM Maven brakes and Reserve’s carbon 30|HD C front and 31|DH rear rims on DT Swiss 350 hubs.

  • £9,999

Santa Cruz Vala XX AXS RSV

Top of the tree gets you all the bells and whistles.

An XX AXS Transmission, Ultimate level Maven brakes, carbon rims with i9 Hydra hubs and of course, Factory level fork and shock.

You’ll have to dig deep, though.

  • £11,999