About The Bontrager Line Pro 55mm 0° 35mm Black Stem
The Bontrager Line Pro is a 55mm, 0° mountain bike stem with a 35mm bar clamp, forged from 7075-T73 3D aluminum. It is a short trail stem made to pair with a 35mm handlebar.
The oversized 35mm clamp adds strength and lowers the combined bar and stem weight. A Blendr base and mount are included for integrated mounting of a light or computer, and the hardware is high-strength, corrosion-resistant steel.
Who It's For
- Mountain riders running a 35mm-clamp handlebar who want a 55mm stem.
- Riders who want a light or computer mounted cleanly on the stem with Blendr.
- Riders with a 31.8mm bar should look elsewhere; this stem only fits 35mm bars.
What to Look For
- Bar clamp: 35mm. Check your handlebar's center clamp diameter.
- Length and rise: 55mm at 0°. A short stem quickens steering and shortens reach.
- Accessories: Blendr base and mount included; Knock Block and standard headsets supported.
Key Features
7075-T73 forged aluminum. 3D forged for strength at low weight.
35mm bar clamp. Oversized clamp diameter for increased strength and a lighter bar and stem system.
Calibration marks. Laser-etched marks make setting the bar angle simple and repeatable.
Blendr integration. Included Blendr base and mount for a light or computer.
Hardware and finish. High-strength, corrosion-resistant steel bolts; black finish. Compatible with Knock Block and standard headsets and spacers.
Rider Intent Summary
- Biggest strengths: Forged 7075 aluminum, 35mm clamp, and Blendr mount in the box.
- Tradeoffs: Requires a 35mm handlebar; flat 0° rise does not add bar height.
- What makes it different: Integrated Blendr accessory mounting on a short trail stem.
Victory's Take
At Victory Bicycle Studio we reach for 55mm when a rider needs a little more room on a shorter frame, then confirm handling still feels settled at speed.
Specifications
- Brand: Bontrager
- Model: Line Pro
- Length: 55mm
- Rise: 0°
- Bar clamp: 35mm
- Material: 7075-T73 3D forged aluminum
- Color: Black
- Bolts: High-strength, corrosion-resistant steel
- Compatibility: Knock Block and standard headsets and spacers; Blendr base and mount included
- Part number: 599086
What you get

Bontrager Line Pro 55mm 0° 35mm Black Stem
Frequently Asked Questions
Do you offer free shipping?
We do offer free shipping on non-bike orders over $100. We do not offer free shipping for bicycles unless it is a one time promotion. Generally, bike shipping will cost $150 and that covers just the shipping of the bike with no assembly. If you were to bring that bike to your local mechanic or bike store, you would pay them their assembly fee. If you choose our Professional Assembly option for $200, our service technicians would assemble the bike before shipping and then re-pack the bike safely for transit. When you receive the bike you would attach the front wheel, attach the seatpost/saddle, and raise the handlebars and clamp them. Those three items do have to be detached to minimize or eliminate the chance of damage in transit.
How much does shipping cost?
For orders of parts, accessories, apparel, etc. on orders under $100, shipping is a flat rate of $9.99. Regular bike shipping without assembly is $150, bike shipping with Professional Assembly is an additional $200 (so $350 in total which includes the $150 of regular shipping). Our White Glove Delivery option is $699 and that will cover the assembly of the bike and our White Glove Delivery partner delivering your dream bike to your front door, ready to ride!
How can I track my order?
When you place your online order, you will receive an instantaneous email update with your order number and order details, and shortly after, you will receive a follow up order email with the tracking number for your order. If you still need assistance with your order, feel free to email us at online@victorybicyclestudio.com and we will respond asap.