Bike details
Overview
Key information split into simple groups.
Bike summary
-
-
Frame Steel -
Wheels 29" -
Travel Front 120mm -
Fork Fox Factory Float 34
-
Groupset GX, Truvativ Stylo -
Suspension Hardtail -
Drivetrain 1 × 12 -
Brakes Hydraulic Disc
Sizing
Recommended size guide.
SM
158cm - 171cm
MD
168cm - 180cm
LG
178cm - 189cm
XL
186cm - 199cm
Parts list
Components
Main components, grouped by system.
Bike components
Frame
Frame
Chromoly
Suspension Fork
FOX 34 Factory Float FIT4, Kashima coating, EVOL air canister, 3-position compression adjustment
Rear Shock
N/A
Drivetrain
Rear Derailleur
SRAM Eagle GX, 12-speed
Front Derailleur
N/A
Shift Levers
SRAM Eagle GX, 12-speed
Cassette
SRAM XG-1275, 10-50 tooth
Crank
SRAM Stylo 7K Eagle
Bottom Bracket
Pressfit
Chain
SRAM GX Eagle, 12-speed
Chain Guide
N/A
Pedals
N/A
Wheels
Front Hub
Stan's NoTubes Neo/ZTR Arch MK3, 15mm x 110mm, 12mm x 148mm
Rear Hub
Stan's NoTubes Neo/ZTR Arch MK3, 15mm x 110mm, 12mm x 148mm
Rims
Stan's NoTubes Neo/ZTR Arch MK3
Tires
Front: Maxxis Ardent 2.4", dual compound, tubeless ready, Rear: Maxxis Ardent 2.25", dual compound, tubeless ready
Brakes
Brakes
SRAM Guide R, 180mm front / 160mm rear rotors
Brake Levers
SRAM Guide R
Cockpit
Stem
Race Face Aeffect R, 50mm length
Handlebar
Race Face Aeffect R, 780mm width, 20mm rise
Grips
Niner Grrrips, nylon flanges
Headset
Niner headset, zero-stack SHIS, ZS44/28.6, ZS56/40
Seat
Saddle
Niner Custom TR, chromoly rails, printed Niner graphic
Seatpost
KS Lev Integra SI
Fit data
Geometry
Numbers for sizing and ride feel.
| Size | SM | MD | LG | XL |
|---|---|---|---|---|
| Stack Reach Ratio | 1.5 mm | 1.46 mm | 1.43 mm | 1.41 mm |
| Bottom Bracket Height | 322 mm | 322 mm | 322 mm | 322 mm |
| Front Center | 696 mm | 714 mm | 740 mm | 767 mm |
| Rake | 54 mm | 53 mm | 54 mm | 54 mm |
| Trail | 93 mm | 94 mm | 93 mm | 93 mm |
| Stack | 607 mm | 616 mm | 630 mm | 648 mm |
| Reach | 406 mm | 421 mm | 441 mm | 461 mm |
| Top Tube Length | 591 mm | 599 mm | 623 mm | 648 mm |
| Seat Tube Angle | 74 ° | 74 ° | 74 ° | 74 ° |
| Seat Tube Length | 396 mm | 421 mm | 485 mm | 533 mm |
| Head Tube Angle | 68 ° | 68 ° | 68 ° | 68 ° |
| Head Tube Length | 100 mm | 110 mm | 125 mm | 145 mm |
| Chainstay Length | 423 mm | 423 mm | 423 mm | 423 mm |
| Wheelbase | 1114 mm | 1132 mm | 1158 mm | 1185 mm |
| Bottom Bracket Drop | 52 mm | 52 mm | 52 mm | 52 mm |
| Standover Height | 717 mm | 735 mm | 787 mm | 826 mm |
| Wheels | 29" | 29" | 29" | 29" |
| Rider Min Height | 158 cm | 168 cm | 178 cm | 186 cm |
| Rider Max Height | 171 cm | 180 cm | 189 cm | 199 cm |
Model Overview
SIR 9 29 3-Star belongs to the Niner Sir model. Niner released 44 bikes variations of this model so far. Check out the entire range from 2018 of this model, by clicking this link.
Model range prices
Niner SIR 9 27.5+ 1-Star 2018 is the most affordable bike of this model and has a price of 2300$. On the other hand, Niner SIR 9 5-STAR 2018, is the most expensive and costs 5950$.
Safety
Make sure you wear a helmet on every ride, and that your bike performs well. In short, this means checking the tires, brakes, and chain to make sure everything is in good working order.
Trail bikes average price
According to our math, the average price for a trustworthy Trail bike is 2762$. However, even though the average price of a Trail bike is lower, you might still be able to get a top-quality bike. In conclusion, always check bike reviews and their components before making a purchase to make sure you don’t overpay.
When Niner released this model in 2018, its price was 3950$. Doing a quick comparison, we notice that SIR 9 29 3-Star price is 43.01% more expensive than the average cost of a Trail bike.
Overview of components
Fork
The SIR 9 29 3-Star comes factory-installed with the Fox Factory Float 34 fork. This has a travel range of 120mm. Bike forks are good shock absorbers and provide a smooth ride and a great experience. 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 SIR 9 29 3-Star model has 29″ aluminum wheels. With 29″ wheels, bumps will feel lighter and you’ll gain more speed on descends, compared to smaller wheel-sized bikes. However, if you’re not a tall person, you might find it difficult to adapt to this wheel size.
Brakes
We ride faster and faster, so a good braking system is essential on a bike nowadays. The SIR 9 29 3-Star comes with Hydraulic Disc brakes. These kinds of brakes are among the most popular models used on bikes. To sum up, these are ideal for anyone.
Sizes
There are 4 sizes available for this model. Rider height can be anywhere between 158 cm – 199 cm (5.18 ft – 6.53 ft). In conclusion, you won’t have a problem finding one that suits you.
Dropper post
Every bike should have a dropper post, and this one does. If you are a technical rider, a dropper post is essential. A dropper post provides increased safety while riding. The lever system, allows you to move your saddle up and down, which is very useful on climbs and descends.