Highlights:
- This steel hardtail is ready to spice up your favorite trails.
Master Mechanic's Notes
- Moderate scratches on the inside of the chainstays & chainstay arch.
- Small paint chip on the drive side chainstay.
- Small scuffs on the non drive side head tube.
- Light scratches on the rims & the fork lower legs.
- Light scratches on the non-drive side chainstay.
TPC Guarantee
This bike passed a 141-point inspection and received a full pro-tune by our Master Mechanics in our Certified Pre-Owned process. CPO bikes are pristine and ready to ride!
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30-Day Hassle-Free Returns
Shop with confidence. Every bike is covered by our 30-day satisfaction guarantee. If this bike isn’t perfect for you, get in touch and we’ll help you find the right bike.
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RideFast Shipping
Assemble your bike in 15 minutes or less! Our bikes ship in our RideFast box for speed and safety. All tools you need to assemble are included.
Learn more| Year | 2020 |
| Brand | Niner |
| Model | Sir 9 |
| Size | Large |
| Frame Material | Steel |
| Drivetrain | SRAM, 1x11 spd |
| Weight | 29 lbs 1 oz |
| Fork | RockShox RL Gold |
| Fork Travel | 120mm |
| Rear Shock Travel | N/A |
| Brakes | SRAM Level, Disc - Hydraulic |
| Shifters | SRAM NX , Mechanical |
| Rear Derailleur | SRAM NX |
| Bottom Bracket Shell | Press fit |
| Crankset | SRAM NX Alloy, 32t, 175mm |
| Cassette | SRAM PG-1130, 11-42t |
| Chain | SRAM |
| Handlebar | Race Face Aeffect Alloy, 770mm |
| Headset | Niner |
| Stem | Race Face Aeffect Alloy, 35.0mm x 50mm, 6° |
| Seatpost | Niner Alloy, 30.9mm |
| Saddle | Niner Custom |
| Front Axle Spacing | 15x110mm (Thru-Axle) |
| Rear Axle Spacing | 12x148mm Boost |
| Wheelset | Niner Aluminum Tubeless Compatible, Niner |
| Front Tire | Maxxis Ardent, 29" x 2.4" |
| Rear Tire | Vittoria Mezcal Graphene 2.0 XC-Trail, 29" x 2.25" |
| Tire Type | Tubeless |
| Tubeless Compatibility | Bike ships tubeless |
| Charger Included | N/A |
We take pride in offering exceptional customer service. If you have any questions, email us or give us a call.
| Recommended Rider Height | 5'10" - 6'1" |
| a. Effective Top Tube | 627 mm |
| b. Seat Tube | 485 mm |
| c. Seat Tube Angle | 74° |
| d. Head Tube Angle | 68° |
| e. Head Tube | 125 mm |
| f. Stack | 634 mm |
| g. Reach | 445 mm |
| h. Standover Height | 791 mm |
| i. Saddle Height Range | N/A |
“I love this company! My beautiful bike arrived promptly, was packed brilliantly, and tuned perfectly. It was exactly as described.”
— Kari K.
“In the past month, I purchased a road bike and MTB from TPC. Very happy with the price and condition of both bikes! I was riding the bikes 10 minutes after I received them.”
— David H.
The chart below provides a general suggested height of range for Mountain Bike sizes and is not exact. Sizing may vary across brands.
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The tailoring of any bike is an important step in the long term enjoyment of riding and it can take time to adjust to the fit of a new bike. All contact points (pedals, shoes, and saddle) can be changed and altered for personal preference, performance, and comfort.
| Measured Frame Size | Frame Size | Min Rider Height | Max Rider Height |
|---|---|---|---|
| 13 in | XS | 4' 10" | 5' 2" |
| 15 in | Small | 5' 2" | 5' 6" |
| 17 in | Medium | 5' 6" | 5' 10" |
| 19 in | Large | 5' 10" | 6' 2" |
| 21 in | XL | 6' 2" | 6' 5" |
Contact our Ride Guides if you have any questions about the fit of your new bike.
866.401.9636 - rideguides@theproscloset.com
Highlights:
- This steel hardtail is ready to spice up your favorite trails.
Master Mechanic's Notes
- Moderate scratches on the inside of the chainstays & chainstay arch.
- Small paint chip on the drive side chainstay.
- Small scuffs on the non drive side head tube.
- Light scratches on the rims & the fork lower legs.
- Light scratches on the non-drive side chainstay.
Our experts inspect each bike and rate its components on a scale of 1-10. The condition chart’s Overall Rating is the average of those individual components, helping you tell how much overall wear a bike has. We don’t sell anything that scores below a 7. Along with the condition chart, look closely at the bike’s detail images, which highlight any wear or damage.
These bicycles are good as new, often built right out of the box from the manufacturer. Original stickers, parts, and accessories are included. The frame and wheels might have minor blemishes or scuffs from transportation or showroom display. Drivetrain, levers, cockpit, and suspension (where applicable) are in new condition.
While these bikes have been ridden, they remain in excellent condition. Frame and wheels show slight signs of wear with only minor scuffs and scratches — no paint chipping. The drivetrain shows light wear but the derailleurs, shifters, and levers have not sustained any damage. The cockpit has light wear, primarily on the grips or handlebar tape. Bikes with suspension components have minor scuffs and scratches on the fork legs and shock, and the stanchions are immaculate.
To earn a rating in this range, bicycles have sustained some wear but no significant damage. The frame will have slight paint loss, scratches, and/or scuffs. Wheels will also have minor cosmetic damage on rims, spokes, and/or hubs. The drivetrain will have wear from normal usage and there will be slight scratches and scuffs on derailleurs, shifters, and levers. Cockpit, saddle, and suspension lowers (where applicable) will also have cosmetic scuffs and scratches.
Bikes in this range are well-loved and have moderate wear. While the frame and wheels will have cosmetic scuffs, scratches, and/or paint loss, they will not be structurally damaged. Aluminum, steel, and titanium frames may have minor dents. Carbon frames may have been previously damaged, but have been professionally repaired and are structurally sound. Aluminum rims may have minor dents. The drivetrain has moderate to heavy wear. Handlebars, stem, derailleurs, and levers show moderate scuffing or scratches, and the saddle might have slight tears. If the bike has suspension, those components will have scratches and scuffs. The stanchions may have small scratches.
We do not sell bikes that we rate lower than 6 on the condition scale. For example, this includes bikes with major dents, carbon fiber damage, excessive drivetrain wear, and/or moderate to significant suspension component wear.
Highlights:
- This steel hardtail is ready to spice up your favorite trails.
Master Mechanic's Notes
- Moderate scratches on the inside of the chainstays & chainstay arch.
- Small paint chip on the drive side chainstay.
- Small scuffs on the non drive side head tube.
- Light scratches on the rims & the fork lower legs.
- Light scratches on the non-drive side chainstay.
These bicycles are good as new, often built right out of the box from the manufacturer. Original stickers, parts, and accessories are included. The frame and wheels might have minor blemishes or scuffs from transportation or showroom display. Drivetrain, levers, cockpit, and suspension (where applicable) are in new condition.
While these bikes have been ridden, they remain in excellent condition. Frame and wheels show slight signs of wear with only minor scuffs and scratches — no paint chipping. The drivetrain shows light wear but the derailleurs, shifters, and levers have not sustained any damage. The cockpit has light wear, primarily on the grips or handlebar tape. Bikes with suspension components have minor scuffs and scratches on the fork legs and shock, and the stanchions are immaculate.
To earn a rating in this range, bicycles have sustained some wear but no significant damage. The frame will have slight paint loss, scratches, and/or scuffs. Wheels will also have minor cosmetic damage on rims, spokes, and/or hubs. The drivetrain will have wear from normal usage and there will be slight scratches and scuffs on derailleurs, shifters, and levers. Cockpit, saddle, and suspension lowers (where applicable) will also have cosmetic scuffs and scratches.
Bikes in this range are well-loved and have moderate wear. While the frame and wheels will have cosmetic scuffs, scratches, and/or paint loss, they will not be structurally damaged. Aluminum, steel, and titanium frames may have minor dents. Carbon frames may have been previously damaged, but have been professionally repaired and are structurally sound. Aluminum rims may have minor dents. The drivetrain has moderate to heavy wear. Handlebars, stem, derailleurs, and levers show moderate scuffing or scratches, and the saddle might have slight tears. If the bike has suspension, those components will have scratches and scuffs. The stanchions may have small scratches.
We do not sell bikes that we rate lower than 6 on the condition scale. For example, this includes bikes with major dents, carbon fiber damage, excessive drivetrain wear, and/or moderate to significant suspension component wear.
