Words by Flow, YT Industries | Images by Flow, YT Industries

Not even one month after presenting the new 2017 bike range YT is at it again, rolling out another trail bike – the JEFFSY 27.

No, YT haven’t introduced another wheelsize, they’ve just decided to abbreviate 27.5″ to plain old 27. What they have introduced though is more options in their acclaimed Jeffsy line up. Now you can buy the Jeffsy in both 29″ and 27.5″ options, in both carbon and aluminium models.

The top of the line Jeffsy 27 CF Pro Race.

The top of the line Jeffsy 27 CF Pro Race.

We’re currently testing a Jeffsy CF Comp 2 and loving it, and it’s exciting to see YT offer both wheelsize options for this popular trail bike. Read on for the official word, and be sure to watch the video, although we’re not sure what the nickname ‘doggy’ is all about.


JEFFSY 27 – Size Doesn’t Matter:

It was only last year that YT appeared in the all-mountain market, where they made quite an impression. This segment now sees further growth with the arrival of another model: The JEFFSY 27 is the right choice for those seeking an even more agile and playful bike than the JEFFSY 29 – already one of the most fun-loving 29ers on the market.

We're enjoying our time aboard the Jeffsy CF Comp 2.

We’re enjoying our time aboard the Jeffsy 29 CF Comp 2.

When it comes to getting aggressive, JEFFSY 27 follows in the footsteps of its big brother, too: in giving it a little bit of extra travel, the developers made sure this 27.5” bike won ‘t get hung up on rough terrain. It is available with 160mm of travel on the top of the range model, and 150mm on the rest of the line-up. When it comes to suspension travel, the 160mm JEFFSY CF Pro Race is most suited for racing applications, where in addition to pedaling efficiently the bike also needs to have a tad more gravity potential. YT team rider Bryan Regnier will use JEFFSY for several Enduro World Series races this season.

EWS racer Bryan Reigner races on both the Jeffsy and Capra.

EWS racer Bryan Regnier races on both the Jeffsy and Capra.

“When choosing the right wheel size for you, your personal preferences, your riding style, and of course also the terrain you ride plays an important role in the decision. Everybody should decide for themselves which wheel size is most appropriate for them. At the end of the day, it’s not about numbers but about how much fun you’re having on your bike. Everything is what you make of it.” Markus Flossmann, CEO.


Technical Data:

The carbon frame weighs in at a scant 2300 grams, while its aluminum counterpart tips the scales at 2900 grams. Just like on the JEFFSY 29, a Flip Chip lets you dial in your ride: in the low position, you get an aggressive, 66-degree head angle and a significant BB drop (15mm). Those who climb a lot might prefer the high position, which yields a 75.5-degree effective seat angle.

Naturally, YT’s highly acclaimed V4L suspension layout is also used on JEFFSY 27; it provides great small-bump sensitivity, good mid-stroke support and significant end-stroke progressivity. The BOOST standard was used for the rear axle spacing and the crank in order to provide more space between the chain ring, chain stays, and tire. An E-Type mount makes sure you can always install a front derailleur, even on the single chain ring models. Last but not least, the protectors on the stays help keep drive train noise to a minimum, whilst the discretely integrated alloy “chain suck guides” protect from damage caused by a fallen chain.

You can run a front derailleur on the Jeffsy 27.

You can run a front derailleur on the Jeffsy 27.


The Carbon Models:

The JEFFSY 27 is available in four carbon versions: CF Pro Race, CF Pro, CF One, and CF Two. The top of the line JEFFSY 27 CF Pro Race features only the very best parts, which makes it an ideal choice for racers and pro riders. It’s also the only bike in the range that offers 160mm of travel, ready to get rowdy. The Kashima coated FOX Factory suspension components were designed for aggressive trail riding and serious enduro racing, and they are both ready to mix it up with the best. Drivetrain wise the choice fell to e*thirteen, being a very reliable and robust cassette for racing with its perfect range of gears. Carbon wheels, cranks, and handlebar help keep JEFFSY’s weight really low, this rocket weighs a mere 12.4 kg.

The Jeffsy 27 CF Pro.

The Jeffsy 27 CF Pro.

The JEFFSY 27 CF Pro is also a convincing package with extraordinary specs: The FOX Performance Elite suspension shines with top-class responsiveness on aggressive downhill sections as it comes with exact the same damping cartridge as the big brother Factory Series. In fact, the only difference between the Performance Elite fork and the Factory Series are the hard-anodized stanchions. Another eye-catcher on the CF Pro: the SRAM Eagle transmission which with its twelve gears makes the front derailleur superfluous. Those who prefer RockShox suspension will find themselves in great company with the JEFFSY 27 CF One or CF Two. The CF One offers a crisp, 11-speed SRAM transmission while the CF Two provides 2×11 gears via Shimano’s XT group.

The Jeffsy 27 CF 2.

The Jeffsy 27 CF 2.


The Aluminum Models:

When it comes to aluminum, YT offers a choice between the JEFFSY 27 AL One and AL Two. Neither have anything to envy their carbon colleagues, since they are both based on the same frame platform. The user-friendly suspension components are easy to set up and adjust, even for beginners. Both bikes offer 150mm of ready-to-rumble suspension travel front and rear: A RockShox Pike RC fork and Deluxe RT shock on the AL One, and a RockShox Pike RC and Deluxe R on the AL Two. The biggest difference between the two aluminum models is the drivetrain: the AL One features a SRAM X1 1×11 transmission while the AL Two goes 2×11 with SRAM GX.

The Jeffsy 27 AL 1 has an excellent value for money spec.

The Jeffsy 27 AL 1 has an excellent value for money spec.

All models come in S, M, L, and XL sizes and are available to order as of today on the website www.yt-industries.com. 


JEFFSY 27 CF Build Kits:

JEFFSY 27 CF Pro Race

JEFFSY 27 CF CF Pro

Fork

Fox 34 Float Factory

Fox 34 Performance Elite

Shock

Fox Float X Factory

Fox Float DPS Performance Elite

Travel (F/R)

160mm / 160mm

150mm / 150mm

Crank

Race Face Next SL

SRAM X01 Eagle

Transmission

SRAM X01

SRAM X01 Eagle

Wheels

E.13 TRSr SL

E.13 TRS+

Tires (F/R)

E.13 TRSr / E.13 TRS+

Maxxis High Roller II

Stem

Renthal Apex 35

Race Face Turbine 35

Handlebar

Renthal Fatbar Carbon 35

Race Face SIXc 35

Brakes

SRAM Guide Ultimate

SRAM Guide RSC

Seatpost

RockShox Reverb stealth

Race Face Turbine

Weight*

12,4 kg

12,6 kg

Price

4.499 EUR / 3.799 GBP

3.999 EUR / 3.399 GBP

5.599 USD

4.799 USD

6.999 CAD

5.999 CAD

7.999 NZD

6.899 NZD

7.799 AUD

6.499 AUD

99.900 ZAR

87.900 ZAR

 

JEFFSY 27 CF One

JEFFSY 27 CF Two

Fork

RockShox Pike RCT3

RockShox Pike RCT3

Shock

RockShox Deluxe RT3

RockShox Deluxe RT3

Travel (F/R)

150mm / 150mm

150mm / 150mm

Crank

Race Face Turbine

Race Face Turbine

Transmission

SRAM X1

Shimano XT

Wheels

E.13 TRS

E.13 TRS

Tires (F/R)

Maxxis High Roller II

Maxxis High Roller II

Stem

Race Face Turbine 35

Race Face Turbine 35

Handlebar

Race Face Turbine 35

Race Face Turbine 35

Brakes

SRAM Guide RS

SRAM Guide RS

Seatpost

Race Face Turbine

RockShox Reverb stealth

Weight*

12,9 kg

13,3 kg

Price

3.399 EUR / 2.899 GBP

3.399 EUR / 2.899 GBP

3.999 USD

3.999 USD

4.999 CAD

5.099 CAD

5.799 NZD

5.799 NZD

5.499 AUD

5.599 AUD

72.900 ZAR

74.900 ZAR

unnamed

JEFFSY 27 AL Build Kits:

JEFFSY 27 AL One

JEFFSY 27 AL Two

Fork

RockShox Pike RC

RockShox Pike RC

Shock

RockShox Deluxe RT

RockShox Deluxe R

Travel (F/R)

150mm / 150mm

150mm / 150mm

Crank

Race Face Turbine

Race Face Aeffect SL

Transmission

SRAM X1

SRAM GX

Wheels

DT Swiss M1900 SPLINE

DT Swiss M1900 SPLINE

Tires (F/R)

Maxxis High Roller II

Maxxis High Roller II

Stem

Race Face Turbine 35

Race Face Aeffect 35

Handlebar

Race Face Turbine 35

Race Face Aeffect 35

Brakes

SRAM Guide RS

SRAM Guide R

Seatpost

E.13 Dropper Post

RockShox Reverb stealth

Weight*

13,5 kg

13,5 kg

Price

2.599 EUR / 2.199 GBP

2.099 EUR / 1.799 GBP

2.999 USD

2.599 USD

3.799 CAD

3.199 CAD

4.299 NZD

3.599 NZD

3.999 AUD

3.499 AUD

55.900 ZAR

46.900 ZAR

*Frame size S without Pedals

Due to manufacturing tolerances on individual components the weight may vary by +/- 2%.


JEFFSY 27 Geometry:

S

M

L

XL

Toptube (horizontal)

573 mm

602 mm

625 mm

648 mm

Reach

415 mm

440 mm

460 mm

480 mm

Stack

584 mm

597 mm

611 mm

620 mm

Seat tube

410 mm

450 mm

480 mm

520 mm

Chain stay

430 mm

430 mm

435 mm

435 mm

Head angle (High/Low)*

67°/66°

67°/66°

67°/66°

67°/66°

Seat tube angle (eff)*

75,5°/74,5°

75,5°/74,5°

75,5°/74,5°

75,5°/74,5°

Seat tube angle (act)*

69°/68°

69°/68°

69°/68°

69°/68°

BB drop (High/Low)*

5/ 15 mm

5/ 15 mm

5/ 15 mm

5/ 15 mm

Wheelbase

1138 mm

1169 mm

1200 mm

1224 mm

Head tube length

95 mm

110 mm

125 mm

135 mm

Standover height

708 mm

737 mm

752 mm

782 mm

*Values depend on the position of the Flip Chips (High/Low) and suspension travel (160 mm/150 mm).

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