Bike details
Overview
Key information split into simple groups.
Bike summary
-
-
Frame Aluminum -
Wheels 27.5" -
Travel Front 80mm -
Fork RST F1RST
-
Groupset SLX -
Suspension Hardtail -
Drivetrain 1 × 11 -
Brakes Hydraulic Disc
Sizing
Recommended size guide.
14"
140cm - 158cm
16"
155cm - 170cm
Parts list
Components
Main components, grouped by system.
Bike components
Frame
Frame
triple butted hydroformed alloy 6061 27.5"
Suspension Fork
RST F1RST 27.5 air, lock out (80 mm)
Drivetrain
Rear Derailleur
SHIMANO SLX
Shift Levers
SHIMANO SLX (11)
Cassette
SHIMANO M5100-11 11-51 (11)
Crank
PROWHEEL 32 teeth 165 / 170 mm cranks
Chain
KMC X11
Pedals
alloy
Wheels
Front Hub
AUTHOR Xenon 32 holes
Rear Hub
AUTHOR Xenon 32 holes
Rims
AUTHOR Xenon TRC 27.5 32 holes
Spokes
black stainless steel 2.0 mm
Tires
CST B-Trail aramid 27.5" × 2.25"
Brakes
Brakes
TEKTRO Gemini disc hydraulic (6" rotors)
Cockpit
Stem
AUTHOR alloy
Handlebar
AUTHOR Flat Top bar 9° 620 / 640 mm
Grips
AUTHOR kratton rubber
Seat
Saddle
AUTHOR Champion Author Navigator
Seatpost
AUTHOR alloy (31.6)
Fit data
Geometry
Numbers for sizing and ride feel.
| Size | 14" | 16" |
|---|---|---|
| Front Center | 636 mm | 651 mm |
| Rake | 43 mm | 43 mm |
| Top Tube Length | 557 mm | 582 mm |
| Seat Tube Angle | 74 ° | 73.5 ° |
| Seat Tube Length | 356 mm | 406 mm |
| Head Tube Angle | 69 ° | 69.5 ° |
| Head Tube Length | 110 mm | 115 mm |
| Chainstay Length | 427 mm | 427 mm |
| Wheelbase | 1059 mm | 1074 mm |
| Bottom Bracket Drop | 45 mm | 45 mm |
| Wheels | 27" | 27" |
| Rider Min Height | 140 cm | 155 cm |
| Rider Max Height | 158 cm | 170 cm |
Model Overview
Ultrasonic 27.5 is part of the Author Ultrasonic model. Author released 15 bikes variations of this model so far. Take a sneak peek at all Author Ultrasonic bikes models from 2022, by clicking here.
Safety
Your safety should be the top priority when you go for a ride. In short, make sure that you always use a helmet, high visibility clothing, and proper lights when riding at night-time.
Average price for Road bikes
According to our math, the average price for a trustworthy Road bike is 365$. However, this doesn’t mean that if you spend less money on a Road bike, you couldn’t get a decent one. To make sure you don’t pay a higher amount than normal for your bike, always do some components analysis and read reviews.
Road bikes average weight
Road bikes weigh an average of 11.29 kg (24.89 lbs). Having an easier bike than average will give you a great advantage on climbs. However, a heavier bike will gain more speed on descends.
Weighing 11.5 kg (25.35 lbs), the Ultrasonic 27.5 model is slightly heavier than average. In other words, this model is 1.86% heavier than the average Road bike.
Ultrasonic 27.5 components
Fork
The Ultrasonic 27.5 comes factory-installed with the RST F1RST fork. This has a travel range of 80mm. Bike forks are perfect to absorb shocks and provide a great riding experience overall. In short, make sure you choose one with a decent fork when you purchase your dream bike.
Wheels size
When leaving the production line, the Ultrasonic 27.5 model has 27.5″ aluminum wheels. The 27.5″ wheels are a great choice for smaller riders. However, the 27.5″ wheels are less forgiving than the 29″ wheels.
Brakes
When you want to stop the bike in time, the brakes are vital. The Ultrasonic 27.5 has Hydraulic Disc brakes. Hydraulic disc brakes are perfect for mountain biking, road cycling, and commuting. To sum up, you can ride your bike with confidence.
Sizes
Author Ultrasonic 27.5 bike has 2 sizes, in the range of 140 cm – 170 cm (4.59 ft – 5.58 ft). In short, it won’t be difficult to find the right one for you.