THE RELENTLESS PURSUIT OF BALANCERISE HIGHER. ROAM FARTHER. RAIL HARDER.
You don’t win by being the lightest. Or the stiffest. Or the toughest. You win by being the fastest. And that takes a wheel designed specifically for the modern mountain biker. At SRAM, we start with the demands of the terrain and work forward from there—carefully balancing each wheel’s design around five key attributes: weight, inertia, engagement, stiffness and durability. No matter where you ride, SRAM wheels will take you further. RISE higher. ROAM farther. RAIL harder.
RAIL HARDERReady to attack, easy to maneuver. Built for aggressive All-Mountain descents, RAIL wheels balance the strength and stiffness you need with the lightness to climb quickly back to the top.
SRAM RAIL 40 WHEELSWith WIDE ANGLE™ rim design providing superior stability, RAIL 40 can withstand the most aggressive All-Mountain / Enduro riding by setting a new benchmark for stiffness in its category. Featuring the perfect balance of strength, lightweight and width for enduro terrain, RAIL 40 delivers high performance ride quality all the way down.
FEATURES / BENEFITS• Available in 27.5” and 29”
• Lightweight but strong aluminum rim, asymmetrical profile with TAPER CORE™ technology. Welded joint
• UST Tubeless
• WIDE ANGLE™ profile—23mm
• SOLO SPOKE™—double butted spokes
• DOUBLE TIME™ ratchet mechanism for durable, quick engagement—SPEEDBALL™ bearings
• Convertible axles:
• Front Hub: QR 9x100, QR Torque Caps, 15x100, 15x100 Torque Caps, 20x110, 15x110, 15x110 Torque Caps
• Rear Hub: QR 10x135, 12x135,12x135 XD, 12x142, 12x142 XD,12x148, 12x148 XD
• Available in XD™ or 10-sp driver body
• BOOST 148 compatible
• Weight: 1810g (27.5”), 1900g (29”) Wheel pair in lightest configuration
• Wheels are priced and sold individually. (
Click here for details on all configurations.)
TECHNOLOGIES
• SOLO SPOKE™
• TAPER CORE™
• WIDE ANGLE™
• SPEEDBALL™
• DOUBLE TIME™
• XD™ DRIVER BODY
• BOOST
FEATURES / BENEFITS
• Available in 27.5” and 29”
• Lightweight but strong aluminum rim, asymmetrical profile with TAPER CORE™ technology. Welded joint
• UST Tubeless
• WIDE ANGLE™ profile—23mm
• SOLO SPOKE™—double butted spokes
• DOUBLE TIME™ ratchet mechanism for durable, quick engagement—SPEEDBALL™ bearings
• Convertible axles:
• Front Hub: QR 9x100, QR Torque Caps, 15x100, 15x100 Torque Caps, 20x110, 15x110, 15x110 Torque Caps
• Rear Hub: QR 10x135, 12x135,12x135 XD, 12x142, 12x142 XD,12x148, 12x148 XD
• Available in XD™ or 10-sp driver body
• BOOST 148 compatible
• Weight: 1810g (27.5”), 1900g (29”) Wheel pair in lightest configuration
TECHNOLOGIES
DOUBLE TIME™
Ratcheting up the smarts. This straightaligned, 4-pawl design turns the 26-tooth ratchet ring into 52 points of contact. The result: smooth 6.9-degree engagement without reducing tooth size or offsetting internal geometry—which means serious long-term durability.
SPEEDBALL™
The only adjustment they’ll ever need was made back at the factory. Every part of the ball bearing comes from the exact same supplier—which means that each bearing bore can be precision machined to fit the bearing race exactly. With tolerances this tight, the days of adjusting play after every ride are over.
SOLO SPOKE™
With SOLO SPOKE™, you’re never wrong. SRAM wheel design eliminates the need for different spoke lengths—one size fits the entire wheel. This identical-length design means no longer wondering whether you have the right front/rear/drive-side/ nondrive-side spoke handy.
TAPER CORE™
Strong in the right places. The sidewalls of SRAM rims are reinforced along the wings to withstand major impact. But the sidewalls then taper in along the center—reducing overall mass. The result is a very light rim with excellent dent resistance.
WIDE ANGLE™
Take corners as fast as you want. SRAM wheels have a wider rim profile without significant added mass. This profile holds tire shape better, preventing tire roll and giving you superior
comfort and traction around corners.
XD™ DRIVER BODY
XD™ is a cassette driver body design that allows the use of a 10-tooth small cog and provides an improved interface with the cassette.
BOOST
BOOST is a new wheel and drivetrain specification that provides: increased wheel stiffness and durability, better riding efficiency and bike handling precision, improved frame geometry with shorter chain stays, wider and stiffer suspension pivots, wider range of chainring options, more clearance for bigger tires.
www.sram.com /
@SramMedia
We're talking about a wheelset, right?
only two pawls engage at any one time, reducing durability without reducing weight.
SPEEDBALL™
the bearings come from a factory just like any other, you you don't have to adjust them after every ride. Just like every other bike you have ever ridden.
SOLO SPOKE™
All the spokes are the same length. This offers little to no advantage to the end user, infact it could be argued that the wheel design is not as optimal as it could have been, in order to allow us to use all the same length spokes. The real advantage is that we only have to buy one size spoke at the factory, dramatically reducing costs at our end.
TAPER CORE™
We have varying wall thicknesses in our rims. Just like everyone else
WIDE ANGLE™
Our rims are quite narrow at 23mm
XD™ DRIVER BODY
Just our way of saying "f*ck you" to the end user
FYP
You may or may not agree with me @gabriel-mission9 but thanks anyway!
What moron writes this shit?
Not only is is nonsense but it's also false as 23mm ID is hardly wide.
about Sram AND katie hopkins
Both examples of the same problem, being that for many people common sense, kindness and any sort of moral virtue go out the window as soon as someone waves some cash under your nose.
Sram I would be willing to forgive if they buck their ideas up and try to spend less time cutting corners in production then selling it as a benefit under some bs acronym.
Katie hopkins on the other hand....well, the world would just be a better place without the deluded old trout if you ask me. And I won't say that about many people....
Learn it: it is the angle the spoke makes from the rim to the flange hole. Wider and symmetric is better as that allows for even tension and higher stiffness. Rear hubs are always plagued with the worst bracing angles, especially when using the same length spokes. Anyone who's ever built a wheel knows that.
How does drilling the rim in-line with the flanges improve bracing angles? The bracing quality will be much nicer than if it wasn't inline, but you'd actually get better bracing ANGLES from NOT drilling inline.
The only two factors that change bracing angles are spoke head placement and nipple placement. That means [flange diameter and width] and [rim ERD and offset].
25 years of bullshit in your head, thinking you know better than everyone, now it's coming out your mouth without any filters. Why do you think your comments are always negative 50?
I never said drill the rim in-line... I said to bring the spokes in line... perhaps you need to learn your grammar again. My comments get negative props whatever because the morons will downvote facts and reality of the world and prop the other folks of similar immaturity during these reviews of new products always attract a lot of morons. And unless they make the prop system NOT anonymous like mtbr did, that will continue to be the case, because as long as they remain anonymous, cowards will continue to hide behind their computer screens.
Gabriell mission - that was damn funny!
[drill the rim in-line with hub flange] = [optimize the drilling in the rim]. Neither of those things improve the bracing angle. Yes or no? Either way, you look like a fool again.
You. Are. The. Moron. Living. In. Your. OWN. Reality. Of. Bullshit. You would fit RIGHT IN with all this marketing and new standards! Like a sheep
Yeah, I'm pretty pissed off at the prospect of having spend more money than I should. That's basically everyone with a brain between their ears. Keep paying for stupid products and "standards", sheep
The wheels I just built used all the same lengths coincidentally and it's really nice. Spoke lengths are usually within 1-2mm of each other so this minimally affects bracing angles or any of that nonsense. And if they design it right, they could theoretically make bracing angles BETTER.
Let's say that the rear drive side needs a 286mm spoke and the non drive side needs a 288mm spoke to compensate for the increased angle it leaves the hub at. Increase the diameter of the non drive side hub flange by 2mm and voila you can use 286's on both side.
i.imgur.com/E9XiaMs.png
Also, the wheel I just built used the same spoke length front and rear, both sides. 286.7mm, 285.9, 285.7, and 286.4. Used 286's all the way around. You think you know more about wheels and hubs than SRAM and Chris King (the hubs I used)? Laughable.
The Canadian IQ system must have a conversion rate just like their monopoly money.
www.ctvnews.ca/canada/canadians-score-lower-on-iq-test-than-americans-prof-discovers-why-1.2284933
Ok so let me get this right... you're feeling slighted/overlooked because I didn't feel the need to comment about how you built your wheels so you're gonna throw on insulting canadians as a nation as well as attack both me and theminsta. I didn't comment about the wheels or spoke calculations to two decimals because I didn't see a point to confirming that you understand wheel building properly since it should have been plainly obvious to all the other wheelbuilders (and the ones that aren't, should learn and stop relying on factory built wheelsets) that you do. It was to me. But apparently you're one of those self-important americans that give your country a bad name... the type who's ideal way to change a light bulb is to just hold onto it and wait for the world to revolve around you. As I've said repeatedly, i care not one bit for how my comments get voted on here by anonymous people hiding behind their computers.
BTW it's "whose" not "who's" in that context.
This is a classic example of people are laughing AT you not WITH you. People aren't hiding behind their computer as if you're some big bad giant who is going to beat them up otherwise. They're just flagging a shitty post as such.
Rear Hub: QR 10x135, 12x135,12x135 XD, 12x142, 12x142 XD,12x148, 12x148 XD
"Can we PLEASE have more hub standards!!!!" - said absolutely no one.
Going strong for 6 months now.
I stopped reading here
It's like listening to an Apple press conference (re-invented, amazing, revolutionary, best ever, etc...). Yes, SRAM your products are great, but you make your audience laugh at you when you write stuff like this.
Seriously, send out a press release like this on the newswire and to your shareholders, but have some respect for us here and don't insult us with this crap. And PinkBike, don't you have any standards left? If I am gonna have to scroll through stupid press releases like this as the new norm, you can expect me to visit a lot less.
Keep getting better at what you are amazing at PinkBike (real bike and component testing, rumors, event coverage, photo epics, etc...) but have some integrity to the sites original values and don't give your advertisers free reign...
WHY THE HELL IT IS CALLED "RAIL 40"?
40 outside ???
As someone who works at a bike shop this would be awesome and greatly help with keeping up to date with all the new products being launched. I know for some this is where they come to learn about new products but maybe just save the front page to actual tests done on new products by Pinkbike's testers. There is nothing worse than having a customer come in asking about the latest and greatest component only to find out its all based on what they read from "that pinkbike post a couple days ago, you know the one? right?"
I would say 90% of the pinkbike user couldn't give to shits about the new wheels with 400 million axle standards. What most want is bike porn in the form of video or photos... If its all about the money then just put a quick 5 second advert at the beginning of pinkbike videos and leave it at that. I mean shit half the people here are watching these videos while at work so its not as if they are in a time crunch so they will probably just watch the 5 second advert knowing that for next 3 minutes they get to do nothing but drool at the screen.
Thank you for not bothering to waste our time
"No one's forcing you to buy it" is such an immature and ignorant thing to say. Please never say that again if you understood anything
This way, we can neg prop the shit out of me and we don't get to see all the moans and graons on every, single, article on this site.