Bike details
Overview
Key information split into simple groups.
Bike summary
-
-
Frame Aluminum -
Wheels 27.5" -
Travel Front 80mm -
Fork RST F1RST
-
Groupset SLX, Suntour -
Suspension Hardtail -
Drivetrain 1 × 11 -
Brakes Hydraulic Disc
Sizing
Recommended size guide.
14"
140cm - 158cm
16"
155cm - 173cm
Parts list
Components
Main components, grouped by system.
Bike components
Frame
Frame
triple butted hydroformed alloy 6061 26"
Suspension Fork
RST F1RST 27 air, lock out (80 mm)
Drivetrain
Rear Derailleur
SHIMANO SLX
Shift Levers
SHIMANO SLX (11)
Cassette
SHIMANO M7000-11 11-46 (11)
Crank
SUNTOUR Zeron 32 teeth 160 / 170mm cranks
Chain
SHIMANO HG601
Wheels
Front Hub
AUTHOR Xenon 32 holes
Rear Hub
AUTHOR Xenon 32 holes
Rims
AUTHOR Xenon Pro 27.5 32 holes
Spokes
black stainless steel 2.0 mm
Tires
CST B-Trail kevlar 27.5" x 2.25"
Brakes
Brakes
PROMAX disc hydraulic (6" rotors)
Cockpit
Stem
AUTHOR alloy
Handlebar
AUTHOR Flat Top bar 9° 620 / 640 mm
Grips
AUTHOR high density foam
Seat
Saddle
AUTHOR Champion CR
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 | 173 cm |
About this model
Ultrasonic 27.5 is an Author Ultrasonic model. Author released 15 bikes variations of this model so far. You can get a glimpse at all models from 2019, by clicking on this link.
Safety
Your safety is a top priority so always wear a helmet when you ride your bike. Moreover, wear the right clothing. You want to be visible to other drivers, so avoid wearing dark clothing.
Average price for Road bikes
Our math shows that the average cost of a dependable Road bike is 365$. However, paying less money than this amount doesn’t mean that you couldn’t get a great Road bike. In conclusion, always check bike reviews and their components before making a purchase to make sure you don’t overpay.
Average weight for Road bikes
The average weight for Road bikes is 11.29 kg (24.89 lbs). You will have a greater advantage on climbs if your bike is easier than the average. On descents, however, a heavier bike will give you extra speed.
With a weight of 11.8 kg (26.01 lbs), Author bike is slightly heavier than average. To sum up, it’s 4.52% heavier than the average weight of Road bikes.
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 good shock absorbers and provide a smooth ride and a great experience. To sum it all, when buying a bike, ensure that you look for a fork capable of decent travel.
Wheels
The Ultrasonic 27.5 2019 bike is equipped with 27.5″ aluminum wheels when leaving the factory. 27.5″ wheels are a mixture between 29″ wheels and 26″ wheels. However, the 27.5″ wheels are less forgiving than the 29″ wheels.
Brakes
We ride faster and faster, so a good braking system is essential on a bike nowadays. The Ultrasonic 27.5 comes with Hydraulic Disc brakes. With Hydraulic Disc brakes, you’ll be able to stop on a dime, even in wet or icy conditions. To sum up, your safety is in good hands.
Sizes
There are 2 sizes available for this model. Rider height can be anywhere between 140 cm – 173 cm (4.59 ft – 5.68 ft). In conclusion, finding one for you shouldn’t be a problem.