Silca has spent decades making the pump on your wall, the multitool in your saddle bag, and the sealant in your tubeless setup. On August 20, it made a tire for the first time ever, and the road version of it doesn’t come in anything you’d call narrow. The Protocol RCR ships in exactly three widths — 29mm, 34mm, and 38mm — with nothing below that. Not 28mm, not 25mm, not the size that’s still stock on a lot of bikes reading this sentence.

That’s not an oversight. It’s a statement. And paired with the fact that Silca talked a famously tire-agnostic gravel pro into his first-ever sponsorship deal to front the launch, this is a company betting hard on where road tires are headed — not where they’ve been.

Quick Verdict

Detail	Info
Launched	August 20, 2026
What it is	Protocol — Silca’s first-ever in-house tire line
Road range	RCR — 29mm, 34mm, 38mm. No narrower option exists.
Price	$99 per tire, every width, road or gravel
Weight	290g (29mm) / 320g (34mm) / 350g (38mm)
Casing	120 TPI Race Casing, “inverse proportional” construction
Gravel range	RCG-1, RCG-3, RCG-4 — 45mm, 50mm, 55mm
Headline signing	Dylan Johnson, pro gravel racer/coach — his first tire sponsorship ever
Independent road testing	None published yet, from Silca or anyone else

Best for: Riders already running 28mm+ who want a lighter, cheaper alternative to Continental or Vittoria Skip if: Your frame won’t clear 29mm, or you’d rather wait for a second opinion before betting on tire brand number one

What Silca Actually Launched

Protocol is four tires, not one. Three are gravel — the RCG-1 for fast, mixed-surface racing, the RCG-3 for the rough stuff (Unbound, Big Sugar-style events), and the RCG-4 for mud and loose adventure riding. The fourth, the RCR, is the one that matters to most people reading this site: a road slick with a light cut-in tread, built around the same casing philosophy as its gravel siblings.

Every one of them costs the same $99, regardless of tread pattern or width, which is a straightforward pricing move for a company whose reputation was built on pumps and shop tools, not rubber. All four use a 120 TPI Race Casing with carbon-fiber BeadLock beads and Silca’s Pulsar compound, wrapped in what the company calls SealSkin or Ghost Shield puncture protection depending on the model. If you buy today, you’re preordering — Silca’s own page has shipments landing by mid-to-late September.

Why the Narrowest Road Option Is 29mm

Here’s the part worth sitting with. Silca didn’t launch a 25mm or 28mm road tire and add wider options later. It skipped narrow entirely. The RCR starts at 29mm — sized, per Silca, around modern 25mm-internal hookless rims — and tops out at 38mm, built to use as much volume as UCI regulations allow for a road-legal tire.

We flagged this shift back in our spring tire setup guide, when we called 28mm “the new minimum” and 30mm “the sweet spot for 2026.” At the time that was a recommendation, informed by what pro teams were already running. Silca just turned it into a floor. A brand new tire line, built from scratch in 2026, with zero legacy narrow SKUs to protect, looked at the market and decided nobody needs anything under 29mm. That’s a much louder signal than another buyer’s guide telling you to size up.

It also lines up with what frame manufacturers have been doing. The Giant Propel clears 32mm. The Cube Litening Aero C:68X grew its clearance to 34mm for 2027, up from 31mm the generation before. When the bikes and now the tires are both built around 29mm-plus as the baseline rather than the exception, the “wide tires are a niche choice” argument is basically dead. Silca just wrote the eulogy.

The Casing Trick: “Inverse Proportional” Construction

Most tire lines add material as they get wider — more casing, more rubber, more weight, because a bigger tire needs more reinforcement, or so the old logic goes. Silca flipped it. In its own words: “Our widest tires use the thinnest casings and, throughout the lineup, add material as tires get narrower.”

The reasoning holds up on paper. A wide tire run at the low pressures modern rims and rims widths allow already spreads impact force over a bigger contact patch — the volume itself is doing protective work that a thick casing would otherwise have to do. So the 38mm RCR gets the thinnest, most supple casing in the range, at 350g. The 29mm gets comparatively more material to make up for its smaller air cushion and higher operating pressure, and still comes in lighter, at 290g, simply because there’s less tire to build.

It’s a clean piece of engineering logic, and it’s also exactly the kind of thing a company sells before anyone outside the company has verified it. More on that below.

Dylan Johnson’s First-Ever Tire Deal

The credibility hook here isn’t the casing copy. It’s the name attached to the launch. Dylan Johnson is a professional gravel racer, coach, and YouTuber who has built an entire public reputation on refusing tire sponsorships — running whatever tested fastest for him personally, brand loyalty be damned, for his entire career. Every tire company that’s ever wanted him on a start list with their logo on his sidewall has been turned down.

Protocol is the one that got a yes. Johnson’s own explanation: “Throughout my career, I’ve avoided official tyre sponsorships so I could strictly run whatever tested fastest in the lab and on the dirt. The Protocol line-up is the first time a tyre checks every box for volume, traction and speed, making this partnership with SILCA an easy decision.”

Take that with the appropriate grain of salt — he’s still a paid partner now, and paid partners say things like that. But the fact that Silca is the first brand in years of him publicly refusing offers to actually land a signature is a stronger trust signal than the usual “pro rides our stuff” press release, and outlets that don’t normally cover product launches with this much interest picked it up specifically because of that angle. Cycling Weekly, Bikerumor, and Cyclist all led with it.

Are Silca’s Protocol Tires Actually Faster?

Silca says yes, backed by its own controlled lab testing — but there’s no independent, third-party data yet for the road tires specifically, so treat the wattage claims as manufacturer-reported until someone else replicates them.

1. The gravel data that exists is Silca’s own. Silca’s published lab numbers have the RCG-1 rolling at 25.8 watts, ahead of the Schwalbe Thunder Burt at 27.0 watts and a Continental rival at 29.6 watts — plus a 125g and 85g weight advantage over those two, respectively.
2. That’s a Silca lab, not an outside one. Nothing on the product page or in any coverage we found attributes that test to an independent facility. It’s the tire company grading its own tire against the competition, which is standard practice and also exactly why you shouldn’t treat it as settled.
3. The road RCR has no rolling-resistance data published at all, from Silca or anyone else, at the time of writing. The 6.2-9 watt claims that showed up on Silca’s own RCR product page compare it to a single Vittoria model, not a field of competitors, and again, it’s Silca’s own test.
4. Wait for a third party. This is the same posture we took on Cube’s aero watt claims this month — a brand-new number from the company selling the product is a data point, not a verdict. Give it a season before you treat “Silca’s tires are faster” as fact rather than marketing copy with decent engineering behind it.

Should You Buy Silca’s First Tires?

If you’re already running 28mm or wider and shopping for your next set of road tires, the RCR is a reasonable bet at a fair price — $99 undercuts most premium tubeless road tires from Continental and Vittoria, and the spec sheet (120 TPI, sub-300g at 29mm, carbon beads) reads like a tire that should be competitive even before anyone’s independently tested it.

If your frame or rim setup can’t clear 29mm, this launch isn’t for you yet, full stop. There’s no narrower Protocol road tire and, based on what Silca has said publicly, no plan to make one. And if you’d rather not be an early adopter on a company’s literal first tire ever produced, that’s a fair, boring, defensible position — wait for a full season of real-world flat rates and an outside lab test before committing your whole quiver to it.

Either way, the width story matters more than the brand story. Silca making tires is a company diversifying into a new product category. Silca making tires that start at 29mm and refuse to go narrower is a company looking at 2026’s data on rolling resistance, comfort, and rim compatibility and deciding the debate over tire width is over. If you’re still on 25mm rubber wondering whether the wide-tire trend is real or a phase, a pump-and-tool company with no tire legacy to protect just told you what it thinks with its entire road lineup.

The Bottom Line

Protocol is a credible first swing from a brand riders already trust for the small stuff — pumps, sealant, tools — now asking for trust on the thing that actually touches the road. The engineering story (inverse proportional casings, 120 TPI, sub-350g weights) is sound on paper. The Dylan Johnson signing is a real credibility marker, not just a name on a press release. What’s missing is independent verification that any of it rolls as fast as Silca says it does, and until that shows up, the smartest move is to treat the width decision — 29mm and up, no exceptions — as the most reliable signal in this whole launch. Everything else is still Silca grading its own homework.

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Pricing, widths, and specifications from Silca’s Protocol product pages. Dylan Johnson quotes and launch coverage from Cycling Weekly and Bikerumor. Rolling-resistance figures for the RCG-1 from Silca’s own product listing; no independent lab has published road RCR data as of this writing.