AUTHOR Ultrasonic 27,5 2023
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Ultrasonic 27,5 2023-24

Colour variants
Wheel size 27,5"Recommended for height 140-173 cm, frame size 14" / 16"Weight 11,5 kgSuper lightweight alloy frame with sport geometry and single chainwheelSuspension Airfork RST Capa and disc brake TektroLightweight tire CST B-TrailShimano Deore components 11 speed
Light junior racing special on 27.5 inch wheels. If you are looking for the best in given category for your rider, this is the right choice! Very light alloy frame made of triple butted tubes, shaped by hydroforming technology, which guarantees strong and very durable process with minimal weight. RST air fork, SHIMANO Deore components, 11 speeds, TEKTRO hydraulic disc brakes with excellent braking performance. A machine that will definitely not be bored on the race route, but will also be a perfect buddy on any trip!
other models
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Technical specification

Size14", 16"
Frametriple butted hydroformed alloy 6061 27.5"
Front forkRST F1RST 27.5 air, lock out (80 mm)
Head partsPRESTINE Integrated 1.5" tapered
Chain WheelPROWHEEL, 32 teeth, 165 / 170 mm cranks
Rear derailleurSHIMANO SLX
ShiftersSHIMANO SLX (11)
Free wheelSHIMANO M5100-11, 11-51 (11)
ChainKMC X11
HubsAUTHOR Xenon, 32 holes
BrakesTEKTRO HD-M530, disc hydraulic (6" rotors)
Brakes leversTEKTRO HD-M530
RimsAUTHOR Xenon TRC 27.5, 32 holes
Spokesblack stainless steel 2.0 mm
TiresCST B-Trail aramid 27.5" × 2.25"
HandlebarAUTHOR Flat Top bar, 9°, 620 / 640 mm
GripsAUTHOR kratton rubber
StemAUTHOR alloy
Seat postAUTHOR alloy (31.6)
Seat clampAUTHOR (34.9)
SaddleAUTHOR Champion (14") / Author Navigator (16")
Weight11,5 kg / 16"

Geometry and sizes

Size 14" 16"
Min. figure [cm] 140 155
Max. figure [cm] 158 170
S/T c-t [mm] 356 406
S/T c-c [mm] 0 0
T/T h [mm] 550 575
T/T a [mm] 544 557
H/T [mm] 110 115
C/S [mm] 420 420
W/B [mm] 1052 1067
S/T ang. [°] 74 73.5
H/T ang. [°] 69 69.5
F/L [mm] 475 475
B/B drop [mm] 45 45
B/B width [mm] 73 73
Reach [mm] 385 403
Stack [mm] 575 582
F/R [mm] 43 43
Handlebars [mm] 0 0
Stem [mm] 0 0
Cranks [mm] 0 0
Choose the height of the character by moving the pointer on the scale.
AUTHOR Ultrasonic 27,5 2023-24

The recommended size and stature are just indicative. It is recommended to always consult your choice with the dealer.

  • S/T c-t - seat tube (center-top), length of the seat tube from the middle of BB parts to its peak
  • S/T c-c - seat tube (center-center), length of the seat tube from the middle of BB parts to an axle of the upper tube
  • T/T h - top tube horizontal, horizontal lenght of the upper tube
  • T/T a - top tube actual, real lenght of the upper tube
  • H/T - head tube, head tube lenght
  • C/S - chain stay, chain brace lenght
  • W/B - wheel base, wheelbase (front and rear axle lenght)
  • S/T ang. - seat tube angel, angle between the seat tube axis and an imaginary line connecting the axes of the front and rear wheel
  • H/T ang. - head tube angel, angle between the head tube axis and an imaginary line connecting axes of the front and rear wheels
  • F/L - fork length, fork length from the head parts bottom to the middle of the front wheel
  • B/B drop - bottom bracked drop, lenght between an imaginary line connecting wheels centers and BB parts, measured from BB parts
  • F/R - fork rake, distances between the head tube axis and fork axis measured at center of the front wheel, so-called. off set

Product options

lime / blue14" = UA#42944100   16" = UA#42944101

additional accessories

AUTHOR Bottle cage ABC-60
with bottle
ABC-60AUTHOR FLY 33 One-Piece Gloss Bottle Cage is made of durable glass fibre-reinforced polyamide and is ... more »
AUTHOR Bottle cage ABC-L&R05
L&R05Bottle cage AUTHOR ABC-L&R05 designed for easy bottle removing from side direction. It is lightweigh ... more »
AUTHOR Bottle cage ACP-X26 Karbon
AUTHOR Bottle cage ACP-X26 Karbon
AUTHOR Bottle cage ACP-X26 Karbon
AUTHOR Bottle cage ACP-X26 Karbon
AUTHOR Bottle cage ACP-X26 Karbon
foto 1
foto 2
X26 KarbonCreated using AUTHOR X26 Carbon - tech construction is superbly strong and incredibly light. Elegant ... more »
AUTHOR Sadle bag A-S381 QF9 X7
S381 QF9 X7The Author saddle bag A-S381 is the easy bag with the Quick Fix 9 bracket for easy click ON/OFF and ... more »
AUTHOR Stand AKS-570 R18
AKS-570 R18Lightweight and high performing kick Stand Author for frame dropout fixation AUTHOR IS-R18. For whee ... more »
AUTHOR Mudguard rear X-Bow
X-BowRear mudguard AUTHOR, modern shorter mudguards with universal bracket, fabric plastic. Weight 163g. more »