Bontrager Comp Stem - 31.8mm

The Bontrager Comp Stem is a Blendr-ready, 31.8mm stem designed for versatility on road, city, and...

Best current price£16.99from Tredz

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TredzBontrager Black Comp 31.8Mm Degree Blendr Road/Mtb Mountain Bike Stem Size 7
£2.95 delivery
£16.99
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Evans Cycles UKBontrager Comp Stem 31.8 Black
£4.99 delivery
£19.99
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FrasersBontrager Comp Stem 31.8 - Black - 60mm
Free delivery in 1–3 days
£19.99
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Leisure Lakes BikesBontrager Comp Stem 31.8mm Black
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£19.99
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Product Information

Full details

The Bontrager Comp Stem is a versatile, high-performance component designed for road, city, and mountain cyclists who demand reliability and clean aesthetics. Its core benefit lies in its Blendr integration, allowing for the seamless mounting of accessories like lights and computers directly to the stem. While it is engineered for compatibility with carbon steerer tubes and handlebars, riders should ensure they have the correct length and rise requirements for their specific bike geometry before installation.

All features

Model Part NumberW5252914
BrandBontrager

Extended Product Information

FAQs

Is this stem compatible with all handlebars?

This stem is compatible with all 31.8mm diameter handlebars, which is the current industry standard.

Can I use this stem on a carbon fork steerer tube?

Yes, the Bontrager Comp Stem is safe to use with carbon steerer tubes.

What is the Blendr system?

Blendr is Bontrager's integrated mounting system that allows you to attach accessories like lights and computers directly to the center of the stem for a cleaner look.

Do I need special tools to install this stem?

You will need a set of hex wrenches and a calibrated torque wrench to ensure safety, especially when dealing with carbon fiber parts.

Are the M5 bolts replaceable?

Yes, if the bolts become damaged or worn, they can be replaced with standard M5 stem bolts.

Does this stem come with a warranty?

Bontrager products typically carry a warranty against defects in materials and workmanship. Check with your local retailer for specific terms.

Troubleshooting

Handlebars feel like they are slipping

Ensure the faceplate bolts are torqued to spec using a torque wrench and verify that carbon assembly paste was used if pairing with carbon components.

Accessory mount feels loose

Check the connection between the Blendr base and the stem faceplate to ensure it is properly seated and tightened.

Creaking sound coming from the cockpit

Remove the faceplate, clean the contact surfaces of both the stem and the handlebar, apply fresh carbon paste, and re-torque the bolts in a cross-pattern.

Pros and Cons

Pros

  • Seamless Blendr accessory integration
  • Carbon-safe for handlebars and steerers
  • Durable, corrosion-resistant hardware
  • Balanced stiffness-to-weight ratio
  • Versatile for multiple cycling disciplines

Cons

  • Requires proper torque tools for installation
  • Limited to 31.8mm handlebar diameter
  • Requires separate purchase of Blendr bases for specific accessories

Setup, Compatibility & Care

Installation of the Bontrager Comp Stem requires a calibrated torque wrench to ensure the M5 bolts are tightened to the manufacturer's specifications. Always apply a thin layer of carbon assembly paste when installing carbon handlebars or steerers to increase friction and prevent slippage. When setting up the Blendr system, verify that you have the correct Blendr base plate that matches your desired accessory model. For maintenance, check the bolt torque periodically, especially if you ride in wet or muddy conditions, and wipe down the faceplate area to remove grit that may cause creaking.

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