Bike details
Overview
Key information split into simple groups.
Bike summary
-
-
Frame Steel -
Wheels 29" -
Travel Front 120mm -
Fork Fox Rhythm 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 Float Rhythm, GRIP damper, EVOL air canister
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
Niner Alloy 29", 15mm x 110mm, 12mm x 148mm
Rear Hub
Niner Alloy 29", 15mm x 110mm, 12mm x 148mm
Rims
Niner Alloy 29"
Tires
Front: Maxxis Ardent F60 2.4", soft compound, Rear: Maxxis Ardent F60 2.25", soft compound
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 2-Star is part of the Niner Sir model. There are 44 bikes that carry this model name. 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 cheapest bike model and costs 2300$. Niner SIR 9 5-STAR 2018 is the most expensive one and costs 5950$.
Safety
Take safety seriously when you ride your bike, and always wear your helmet. Moreover, don’t ride on the sidewalk. This is actually against the law in some states and can be dangerous for both you and pedestrians.
Average price for Trail bikes
According to our math, the average price for a trustworthy Trail bike is 2762$. However, paying less money than this amount doesn’t mean that you couldn’t get a great Trail bike. To make sure you don’t pay a higher amount than normal for your bike, always do some components analysis and read reviews.
Furthermore, this bike was made available in 2018 for 3200$. If we compare this with the average Trail bike cost we notice that the price is 15.86% higher.
SIR 9 29 2-Star components
Fork
The fork installed on this bike is the Fox Rhythm Float 34 model. The travel on this model is 120mm. Bike forks are good shock absorbers and provide a smooth ride and a great experience. In conclusion, always look for a fork with decent travel when you buy a bike.
Wheels size
When it comes to wheels, the SIR 9 29 2-Star bike is equipped with the 29″ aluminum model. These wheels are more forgiving when you go over roots, rocks, bumps, or other obstacles you encounter on your ride. However, the 29″ wheels will add a little more weight to the bike itself.
Brakes
When you want to stop the bike in time, the brakes are vital. The SIR 9 29 2-Star has 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, these are ideal for anyone.
Sizes
SIR 9 29 2-Star comes in 4 sizes, that range from 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. Needless to say, a dropper post will come in handy on climbs and descends. You’ll fall in love with it at first sight!