Review: SRAM Eagle 90 | Cable-actuated Transmission
SRAM’s Transmission technology trickles down to a wallet-friendly and cable-actuated iteration; but is it any good?
Whilst many are obsessed with batteries and Bluetooth, SRAM’s cable-actuated Eagle 90 feels almost refreshing. It promises the best parts of the Transmission system namely toughness, shift-under-load capability, and quiet running whilst it ditches the electronics for a simple cable.
For riders who want reliable performance on the trail without worrying about whether they remembered to charge their derailleur, Eagle 90 lands in a pretty sweet spot. Provided by Cape Cycle Systems, I’ve spent three months testing it on an eBike and despite being so well-priced, I can tell you it does everything perfectly.
The Tech
Launched in March 2025, SRAM Eagle 90 borrows heavily from its wireless siblings. The derailleur still mounts using SRAM’s Full-Mount interface, meaning it clamps around the frame instead of hanging off a replaceable hanger. The idea is simple: make the whole setup as stiff and perfectly aligned so shifts happen exactly how it’s supposed to.
The drivetrain keeps SRAM’s T-Type architecture too, which means you get the familiar Flattop chain, heavy-duty cassette and X-Sync shaping intended to let you shift while putting the power down. There’s a new mechanical shifter to match, available in two flavours: a double-click version for analogue bikes that lets you bump up two gears at once and a single-click version for eMTBs to protect motors, user abuse and warranties. Oh, and by the way, the actuation ratio is unique to Transmission, so older Eagle shifters won’t work with the Eagle 90 mech.
The derailleur itself is one of the most serviceable SRAM has ever released. Nearly every external part can be swapped including the knuckles, links, cage and even the damper can be replaced. If you’ve ever smashed a derailleur on a rock and wished you could rebuild it instead of chucking it, this system is appealing.
Crank options include forged aluminium arms from 155 to 175mm, with a dedicated 150 mm option for eMTBs. The chainring is steel for durability and the crank accepts the same bolt-on bash guards found on the higher-end groups. SRAM Eagle 90 usually pairs with the XS-1275 cassette — a workhorse with good ramping — and the familiar GX-level T-Type chain.
Ride Impressions
The first thing you notice when riding Eagle 90 is how solid and predictable it feels. Shifts are crisp whether you’re soft-pedalling or stomping on a steep climb, which is exactly what made Transmission so popular in the first place. Despite being cable-actuated, shifts still happen very quickly and without hesitation. I love this.
Noise levels are impressively low. Chain slap is minimal thanks to a stout clutch and the whole system feels very well-damped. Long descents with rough chatter don’t rattle it into misalignment, which is a big deal if you’re used to the occasional ghost-click from cable drivetrains.
I’d describe the shifter ergonomics as highly functional, if a tad bulky. The upside of the size is the thumb paddles are big and easy to hit. Of course the shift action has a slightly more mechanical feel compared to the high-end button-pushing feel of electronic pods. Downshifts take a little extra thumb movement than electronic stuff, but the shifter can be set exactly where I want it and dare I say, I prefer it over the electronic pods.
SRAM Eagle 90 makes a lot of sense for eMTB riders. There’s no battery to worry about, no chance of wireless interference and the shift-under-load capability pairs well with the power of modern motors. Switching between my electronic shifting equipped XC bike and this cable actuated Rail+ it’s obvious the Eagle 90 shifts slightly quicker.
Of course the initial set up of cable shifting does take a little longer but once tuned the gears seem to stay tuned for ages. Another thing worth pointing out is I’ve run the system without a chain device (which isn’t ideal) and haven’t dropped the chain, ever. Touch wood. This is testament to the precision shape and sizing of the teeth on the chainring and chain itself.
Verdict
SRAM’s Eagle 90 is an easy drivetrain to get along with and easy for me to recommend. It runs quietly, handles shifting under load extremely well and so far has been incredibly durable. It’s essentially the same shifting performance as the electronic Transmission offering, yet far friendlier on your wallet. Learn more //
| WORDS: Myles Kelsey | IMAGES: Chris Taylor | LOCATION: Helderberg Trails |