ALTA MXR

OVERVIEW

Kreft Moto staff recently spent three weeks testing a 2018 Alta MXR, the electric motocross bike built in California.  You may have seen Josh Hill riding an Alta in the Red Bull Straight Rhythm supercross event last year, where it proved to be remarkably competitive. 

The Alta comes with the same WP suspension components we know from KTM and Husqvarna, so it is a good fit for Kreft Moto services.  We wanted to evaluate the stock suspension and see what we could do to improve it.  Naturally, we were also just curious to ride it.

A summary of our analysis and suspension solutions are below, but if you want to read a more detailed article click HERE.


ANALYSIS

SPECIFICATIONS

Weight

  • Alta MXR = 262.4 lbs.

  • 29 lbs. heavier than a KTM 350 SX-F full of gas (233lbs)

Center of Gravity

  • C.G. is 21mm higher and 25mm farther forward than a KTM 350 SX-F

Weight Distribution

  • Alta 49.6% Front / 50.4% Rear

  • KTM 47.9% Front / 52.1% Rear


ASSESSMENT OF STOCK SUSPENSION AND HANDLING

NEGATIVE

  • Too soft for MX track riding and racing

  • Feels balanced in corners, but not on whoops and jumps

  • Excessive pitching front-to-rear

POSITIVE

  • Strong cornering performance - especially for a heavy bike

  • Excellent traction at both wheels

FORK

Minimal Compression Damping

  • Relies excessively on air spring to absorb impacts

  • Blows through travel = feels harsh past mid-stroke

Excessive Rebound Damping

  • Prone to “packing” - feels harsh on successive impacts (e.g. braking bumps)

SHOCK

Oversprung and Underdamped

  • The shock has a bouncy, free-moving feel reminiscent of enduro suspension

  • OEM shock spring is suited to a 200+ lb rider

  • The combination of a stiff spring and soft damping rear tends to kick up and pitch the rider forward on obstacles that tap both wheels in sequence, like whoops and some jump faces.

 

Kreft Moto Solution

Optimal suspension performance for MX track riding/racing

FORK

  • Install Revalve Control, Kreft’s external revalve system

  • Custom Valving

  • Increased low & mid speed compression damping

  • Reduced rebound damping

  • Create linear spring curve

SHOCK

  • Custom Valving

  • Install correct spring rate for target rider

  • Increased low & mid speed compression damping

  • Increased rebound damping

PERFORMANCE BENEFITS

  • Supports aggressive riding on a full-sized motocross track

  • Stable platform - suspension stays up in the stroke

  • Reduced “packing” on braking and acceleration bumps

  • Improved control on jumps and whoops

  • Eliminate pitching

  • Improved tracking and traction

  • Reduce air spring progression to more closely match a coil-spring fork

  • Utilize full suspension travel without sacrificing bottoming resistance

  • Revalve Control provides a dramatic increase in fork’s adjustability

SUSPENSION DYNO GRAPHS


ALTA MXR PACKAGE PRICING

KREFT AER48 WITH REVALVE CONTROL

$975 + Parts and Fluid

  • Kreft Moto's AER48 Revalve Control system with independent compression, rebound, and Revalve Control adjusters

  • Revalve Control settings table - a guide to tuning your suspension for optimal performance in different conditions

  • Custom valving setting adapted to each customer

  • Air spring modification for a more linear spring curve - like a coil spring fork

  • Nitrogen-charged air spring element for pressure stability

  • Cleaning, inspection, and replacement of wear parts where required

  • Note: cost of wear parts and fluid not included

SHOCK REVALVE

$275 + Parts and Fluid

  • We create and install a custom valving setting optimized for your terrain, speed, riding style, height, and weight

  • Synchronize shock valving with fork valving to create balanced chassis and optimal suspension performance

  • Revalve includes all services provided in a service

OPTIONS


Start the Process: