TRP has managed to position itself as a serious contender in the brake market over the last few years, thanks in no small part to their downhill-focused G-Spec Quadiem stopper that shot to the top of the class when talking about modulation. That brake was made for the likes of Aaron Gwin, but the high-performance arm of Tektro has a new G-Spec model out, this one being a lighter weight brake intended for use on a trail bike.
The G-Spec Trail SL employs the same four-piston caliper as the DH brake - but with different sized pistons - combined with a lighter weight perch. It retails for $149.99 USD per end without rotors, making it $30 USD pricier than the budget-oriented Slate 4 and putting them up against SRAM's $154 USD (w/ rotor) four-piston Guide RS brake. So, let's find out how the two compare.
TRP G-Spec Trail SL• Intended use: trail
• Mineral oil system
• Four-piston caliper
• CNC two-piece caliper
• 14/16mm pistons
• Tool-free indexed reach adjust
• Weight: 312 grams (front, w/o rotor)
• MSRP: $149.99 USD
• More info:
www.trpcycling.com Rotors range from $29.99 USD to $59.99 USD, and that does bump the price of the Trail SL up past where the Guide RS sits. They're available in all the sizes, as well as both six-bolt and Centerlock mounting, and you can find a ton of small parts on their website; if you prefer to fix things yourself, you can probably order what you need instead of having to go to a shop.
The trail bike-oriented G-Spec Trail SL lets you tinker with reach via an indexed dial. There's a four-piston caliper at the other end that works with Shimano pads, too.
DesignTRP makes a point of saying that the Trail SL's finned caliper is the same as what's used for the downhill-oriented G-Spec Quadiem, but that's only partly true. While the Quadiem caliper is home to four 16mm diameter pistons, you'll find 14mm and 16mm pucks inside of the Trail SL's. Both use the same pads, though. The idea with the differently sized pistons is to have the smaller ones lead by just a hair so as to have a controllable initial bite, with the 16mm pistons delivering more power later in the lever's throw.
Externally, the two-piece caliper looks massive compared to the pared-down blocks of aluminum from everyone else, but TRP has machined a load of cooling find onto its roof. It also has the new sleeker bleed fitting and, just like with the Quadiem, you can fit a set Shimano brake pads if that's what you're into.
Up at the other end, the Trail SL's master cylinder and lever blade look like a Weightwatcher's version of the Quadiem's setup. You'll spot the same indexed reach adjustment dial, as well as the same lack of adjustable bite point; TRP makes no apologies for that, instead choosing to go with a simpler, possibly more reliable design.
The clamp is hinged to make life easy, and it plays nice with both I-spec II and Matchmaker mounts as well. It's worth noting that the similarly priced Guide RS sports the same tuning options.
Dry and loose? That's when some extra control comes in handy, and the Trail SLs have it.
PerformanceThe brake's name makes it impossible to mistake their intended use, but I went ahead and bolted them onto Mondraker's 150mm-travel Foxy Carbon XR 29 that is most definitely not a trail rig in most parts of the world. Squamish's often steep singletrack is also most definitely not your average trail riding, either, so I ran them with 180mm rotors front and rear that work well for my 160-ish pound weight. Not your average trail riding then, but if TRP's weight-conscious four-piston stoppers work well here, they'll probably well everywhere.
When I reviewed the DH-friendly G-Spec Quadiem, I said, ''
First, they've been impressively consistent,'' and ''
They offer a remarkable amount of feel and modulation, especially for a four-piston brake intended for downhill use.'' Yeah, I liked 'em a lot, and it's no surprise to me that I could start the G-Spec Trail SL review by using similar words.
If you read that original G-Spec Quadiem review, you'd also know that they offer that relatively gentle initial grab that I prefer over that stick-in-the-spokes power that, while certainly not useless, is also a lot easier to come by than telepathic-like modulation. The Quadiem doesn't really have that brick wall type of power, but what they do have is class-leading modulation, and TRP has done well to carry that same thing over to their four-piston trail brake.
The indexed reach adjustment refused to migrate during my time on them, and the dial is easy to turn.
I used my set of Trail SLs with metallic pads (they come stock with semi-metallic pads installed) and found the power to be enough for my needs and 160lb-ish mass, but also down just a touch compared to the Guides with the same sized rotors. That said, TRP's power comes on in a very linear, direct, and easy to understand way, possibly because there's no tricky linkage driving the plunger as there is on some of the competition. Or maybe that's not the reason why, but my braking fingers tell me that there's certainly something different going on regardless.
As you might expect, that kind of control is nothing but a boon when it's wet or you're near your personal limits. Sure, I think the Guide RS has more outright power, but TRP has 'em beat when talking about modulation. Same goes for Shimano, too, but the big Blue S has a ton more initial bite than anyone else bar the Germans at Trickstuff.
Fade? Pump up? No and no.
Squamish is full of the kind of descents that make your brakes fade and the bottom of your feet burn, but TRP's trail-oriented stoppers proved themselves to be consistent performers. Okay, at 160lb, I'm not the heaviest guy out there, but I can certainly get two-piston brakes to wither under me. That's no surprise, of course, and it's also no surprise that these four-piston brakes don't. I also had exactly zero reliability concerns; the reach setting didn't migrate, there were no weird moose-moaning noises, and I experienced no pump-up, either.
Okay, no fence sitting here: SRAM's Guide RS or TRP's G-Spec Trail SL? The price difference is kind of a wash, although you'll end up spending more on the latter because you'll also need to spring for a new rotor. Outright power? The Guides take it, no question. Modulation? SRAM has always been among the best, and they still are, but TRP has got them with on that front. Reliability? It seems like every brake has its share of people who've had major issues, but Guides have never given me trouble. Neither has anything from TRP, so it's I'll call it even there as well.
So, if I had a set of the Guide RS brakes on my bike and they were performing, I wouldn't run out and buy a set of Trail SLs. On the other hand, if my bike needs a new set of brakes, I'd pick up a set of TRP's new stoppers. Now, if they had an adjustable bite point - if any of TRP's brakes had it - there'd be nothing left for me to moan about.
Pinkbike's Take: | I don't think it's out of line to say that it'll be awhile before TRP has the clout of the more well-known brake companies, but I'd also argue that's only because we're far more used to seeing the likes of SRAM, Shimano or whoever else on the bikes that we drool over. I suspect that'll change in the future, especially if TRP keeps offering no-nonsense, functional brakes that have class-leading modulation.— Mike Levy |
And yes Suntour manufactures for Dvo
Actually the idea of a 4 piston brake with different sized pistons is to archieve even pressure on the pad surface. I bet they cannot control which piston goes out first, it just depends on the friction of a rubber seal.
I always get the feeling with brake tests that there are huge deviations in power because of pad/disc combination, bedding in, bad factory bleeds etc.
Pinkbike should do a brake test rig shootout with equal pads and discs, it will leave lots of discussion material for the comment section.
enduro-mtb.com/en/best-mtb-disc-brake-can-buy
Oh no.
I (personally) hate the way Shimano brakes are so grabby / on off feeling. Are the 4 pots better? Looking for brakes for my new build at the mo. The Hayes are super expensive in Australia and have not much support here -others are recommending Formula Cura 4. Fall back will be guide rsc.
I've found the modulation to be good enough. You can't grab a handful of brake and get away with anything like you can with the Guides, but they have a lot more power. Personally, I find it fairly easy to manage them in comparison to other Shimano brakes I've used.
As most major hydraulic brake brands (Sram, Shimano, Magura) we also require a specific bleed fitting to service our specific design. Due to our bleed port design being different than Shimano at the lever a TRP/Tektro bleed kit has always been required to service our brakes or (Sram, Shimano, Magura). Since our basic bleed kit comes with all the bleed fittings required there is no need to also have the bleed nipple on the caliper. The bleed fitting accomplishes the same thing as the bleed nipple. This allows the nipple to be removed for lower weight, easier cleaning, and improved aesthetics (yes all minor benefits but benefits nonetheless).
If you can not get sufficient information from your local wholesaler we suggest contacting us at info@trpbrakes.com and we can provide any information you need.
The fit and finish of shimano is not comparable, shimano looks like spaceage shit compared to the TRP's bulk and basic lack of aesthetic machining. Fit feel and finish of the materials, shimano 9/10; TRP 7/10.
Reliability: I went through 3 sets of zees, 1 set per year due to leaking levers. Struggled with pad contamination from having to constantly bleed them and mineral oil is like herpes. TRP's in on month 14 without a hiccup and my fluid is way way cleaner than anything I ever got out of my ZEE's which were always black burnt and contaminated. For reliability: Zees6/10, Quadiums 10/10. My friends in bike service had similar lifespans with saint but I also have a friend with working 4yr old m820's.
Feel, The Zees could lock the wheel up on a dime, and I loved the confidence of them, but my dick fingers were always slowing me down, my fingers would get nervous and bam, I slowed down too much and threw off my weight balance. Totally user error, but now that I know better I don't miss the bite. My Quadiems give me what I want when I need it exactly how I want it. All this crap about modulation is hard to understand, but it boils down to, do I get as much braking as I want, not more or less; and quadieums are way more predictable with plenty of power to brake more than you have traction. Feel and use: Shimano 7/10, Quadiums 10/10.
you crack me up, i can't tell if you are trolling or don't know what you are talking about
The G-spec Trail SL uses a similar construction to our downhill brake but uses mismatched pistons to achieve modulation tuned for the slower average speed trail bikes are ridden at. It will have more power than a Slate T4 at a slightly higher weight. The Slate T4 which was designed several years ago was optimized for minimal weight with benefits of four-piston brake that won't break the bank...
Two bolts, designed to snap in an accident. Simpler to manufacture, cheaper to fix and won't ruin your day (as long as you take a cable tie).
Read adjusting bleed process to get bite dialed on TRP is easy; got some quads on order so i guess thatll round out having owned all of them.
Shoudla got into mx... cant cost much more...
I actually get to use an entire set of brake pads while having the same feel which is really a plus. It really comes down to the bleed procedure. I actually bleed them with an old set of worn out pads and a pad spreader rather than the bleed block because at the "worst" case scenario as far as feel goes, the pistons are slightly inboard towards the rotor.
This provides almost instant bite when the pad contact adjust is dialed all the way out (piston towards the caliper).
The problem I always run into is the amount of fluid loss when trying to get the bleed screw back in is a bit more than I'd like. Something that the newer gen guides and codes have solved. I've tried coming up with a solutions but have failed so far.
Shimano pads : check
If it`s as easy to bleed as Shimano`s, then it`s a no contest !