Izzo
vsJeffsy
Same brand, two travel brackets.
The Izzo is YT's sharp 130 mm short-travel trail bike. The Jeffsy is the 145/150 mm all-mountain workhorse that sits a step closer to the Capra.
Izzo
- Lighter, livelier — at 14.3 kg the Core 2 CF is roughly 1.4 kg under the equivalent Jeffsy build, and the high suspension progression rewards pumping over plowing.
- Carbon frame at every price — even the $2,499 Core 1 CF runs the same front triangle as the flagship; YT does not sell an alloy Izzo.
- Climbs like a goat — short 432 mm chainstays and roughly 100% anti-squat give it the most efficient pedaling platform in YT's range.
- Progressive 130 mm rear can feel firm or skittish over high-frequency root mats and rock gardens.
- 65.7-degree head angle and 130 mm fork run out of confidence on steep, sustained enduro-grade descents.
Jeffsy
- Composed at speed — 65-degree head angle, 145/150 mm of travel, and a longer 437 mm chainstay make it noticeably more planted on chunky descents.
- STASH downtube storage on every carbon build — a feature the Izzo's vertical-shock layout makes physically impossible.
- Wider build range — alloy entry from $2,999 to a $6,299 Fox Factory / X0 Transmission flagship. Carbon and alloy at most price points.
- Entry-level alloy Core 1 hits 16.5 kg — heavy enough to feel sluggish on long fire-road climbs.
- Some testers (Off-Road.cc, Singletrackworld) found the 65-degree head angle still a touch steep for genuinely steep terrain.
Editor’s analysis
Both wear the YT badge — but one is the Samurai sword, and the other is the trusty mule.
The Izzo and Jeffsy share a parts bin, a direct-to-consumer price floor, and a Maxxis tire spec — and almost nothing else. The Izzo is a 130 mm carbon-only trail bike with a 65.7-degree head angle, 432 mm chainstays, and a kinematic that PinkBike measured at roughly 37% progression. It is, in YT's own marketing, the Samurai sword: light on its feet, snappy in the corners, allergic to plowing.
The Jeffsy Mk III sits a full travel bracket up — 145 mm rear, 150 mm fork — with a slacker 65-degree head angle, a steeper 77.5-degree seat tube, and 437 mm chainstays in the M size. It also brings tools the Izzo does not: a downtube STASH storage hatch on the carbon frames, a 230 mm-capable Postman V2 dropper, and an alloy build path that drops the entry price to $2,999. Reviewers describe it as "isolated" and "calm" where the Izzo is "taut" and "surgical."
The geometry numbers tell the story plainly. On a size M, the Jeffsy gives up 10 mm more reach, sits 4 mm taller in stack, runs 0.7 degrees slacker up front, and sits 1 degree steeper at the seat — a more modern, more descent-biased package that still climbs with intent. The Izzo's shorter reach and slacker seat tube put the rider in a more central, snappier-handling stance that rewards an active, pumping riding style.
Put another way: the Izzo is the bike for the recovering XC racer who wants flow trails to feel fast again. The Jeffsy is the bike for the rider who needs one full-suspension bike to handle aggressive black-diamond descents, all-day epics, and the occasional bike-park lap without flinching.
Where the builds differ.
Comparing our editor's-pick builds side-by-side. Winners highlighted row-by-row — lower price and weight, and the better-spec component, each mark a point.
Build variants & pricing
Both lineups overlap in the $3–4k bracket, where the comparison is most honest. The Jeffsy then climbs another $2k beyond the Izzo's ceiling.
Editor's picks are the carbon Core 2 builds on each side — same drivetrain tier (XT shifter / SLX rear), same cockpit, same carbon front triangle on each platform. Prices are current US MSRP from yt-industries.com.
How they fit, how they steer.
Both at size M — the fit-picked size for a 5'8" rider on each. The Jeffsy adds 10 mm reach, 4 mm stack, 5 mm chainstay, slackens the head angle by 0.7 degrees, and steepens the seat tube by 1 degree — the more modern descent-leaning shape.
Which size should I buy?
Both lineups span S–XXL with broadly similar reach progressions; the Jeffsy uses size-specific chainstays (437 mm S–L, 442 mm XL–XXL).
→These are starting points. Flexibility, riding style, and preferred position all shift the answer — if you’re between sizes, a professional fit beats a chart.
What the magazines said.
Published reviews from trusted cycling outlets. Click through for the full write-up.
Which one should you buy?
If you want efficiency, agility, and pop on the trails most riders actually ride, get the Izzo. If you need one full-suspension bike that handles black-diamond descents and occasional park days without complaint, get the Jeffsy.
Izzo
If your local network is undulating singletrack, twisty woods, and short punchy climbs — the Izzo will make those trails feel fast and engaging again. It's the rare carbon trail bike that starts under $2,500, climbs like a hardtail, and rewards an active, energetic riding style.
Jeffsy
If you ride one bike on everything from all-day backcountry epics to the occasional bike-park lap, the Jeffsy is the more honest tool. The 145/150 mm of travel, slacker head angle, and STASH storage make it the more capable, more livable do-everything mountain bike — at a real price premium over the Izzo.
Questions buyers actually ask.
Short answers to the things we get emailed about most often.
01Which is the better climber?
The Izzo, by a comfortable margin. It is roughly 1.4 kg lighter than the equivalent Jeffsy build (14.3 kg vs 15.7 kg for the Core 2 CF), runs about 100% anti-squat in the rear, and uses shorter 432 mm chainstays — all of which combine to make it one of the most efficient pedaling trail bikes in its travel bracket.
The Jeffsy still climbs well for a 145 mm bike, helped by its steep 77.5-degree seat tube angle, but it is fundamentally a heavier chassis with more suspension to push uphill.
02Which descends better?
The Jeffsy, especially when the trail gets steep, fast, or chunky. The 65-degree head angle (vs the Izzo's 65.7), 145 mm rear / 150 mm fork (vs 130/130), and 5 mm-longer chainstays add up to a noticeably more planted feel.
Reviewers describe the Jeffsy as "isolated" and "calm" through rough sections; the Izzo, with its highly progressive 130 mm rear, can feel "taut" or "skittish" over root mats and rock gardens. The Izzo is faster on flow; the Jeffsy is more confident on steep DH.
03What's the maximum tire clearance?
Both frames are listed at roughly 61 mm of clearance, which translates to a comfortable fit for the stock 29 x 2.4" tires on the Izzo and 29 x 2.5" / 2.4" on the Jeffsy. Neither is designed around plus-size or 27.5 x 2.8" tires — these are dedicated 29" platforms.
04Does the Jeffsy actually have internal frame storage?
Yes — but only on the carbon frames (Core 2 CF, Core 3 CF, Core 4 CF). YT calls it the STASH system: a downtube hatch with a double-sealed lid and neoprene tool bags. The aluminum Jeffsy frames do not have it.
The Izzo cannot have internal storage because its rear shock is mounted vertically inside the front triangle — that's the same design choice that lets the Izzo fit an unusually large 835 ml "Thirstmaster" water bottle, but it precludes a hatch.
05Is there an aluminum Izzo?
No. Every Izzo build runs the same carbon front triangle, from the $2,499 Core 1 CF up to the $4,499 Core 3 CF. If you want an aluminum YT trail bike at a similar price point, the Jeffsy Core 1 AL ($2,999) and Core 2 AL ($3,699) are your options — both bring 145 mm of travel and a threaded BSA bottom bracket that some riders prefer for long-term maintenance over the carbon frames' press-fit interface.
06How much do they weigh?
YT's published weights for the smallest size, tubeless, no pedals or bottle:
- Izzo: 14.20 kg (Core 3 CF) to 14.90 kg (Core 1 CF) — entire range under 15 kg.
- Jeffsy: 14.60 kg (Core 4 CF) to 16.50 kg (Core 1 AL).
The carbon Jeffsys are roughly 1.0–1.5 kg heavier than the equivalent Izzo. The alloy Jeffsy Core 1 is the heaviest bike in either lineup at 16.5 kg.
07Should I be worried about buying direct from YT?
Less than you used to be. YT now operates YT Mill locations in the US and UK that handle warranty and service questions, which reviewers say has materially reduced the "dealing with an overseas headquarters" anxiety of earlier years.
Both bikes ship in YT's well-regarded "Me First" box that includes a torque wrench, shock pump, and assembly tools. The trade-off versus a brick-and-mortar brand is unchanged: no demos, no local mechanic on the hook, and you do the final assembly yourself.
08Which is the better one-bike-for-everything?
The Jeffsy, almost without qualification. With 145/150 mm of travel, more modern descent-leaning geometry, and a build range that goes from a $2,999 alloy Core 1 to a $6,299 Fox Factory / SRAM X0 Transmission flagship, it covers a much wider spread of terrain and budgets than the Izzo can.
The Izzo is the better choice only if your riding is genuinely undulating-trail-focused and you actively want a sharper, more efficient, more pop-and-pump character. For most riders looking at one full-suspension YT, the Jeffsy is the safer pick.
Similar bikes
If your priorities don’t map cleanly onto either of these, one of these adjacent bikes probably fits better.
Spectral
The Jeffsy's most direct DTC rival — Canyon's all-mountain 29er at a similar travel bracket and similar price floor. Pick this if you want to cross-shop YT against another direct brand.
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Ripley
A boutique-brand counterpoint to the Izzo — the Ripley is a 130 mm short-travel trail bike with a similarly efficient pedaling platform, but with traditional dealer support and a higher carbon price tag.
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Stumpjumper
The default brick-and-mortar alternative that straddles both brackets — the Stumpjumper covers everything from short-travel trail to all-mountain depending on trim, with the Specialized dealer network behind it.
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