Quick Answer
Choose the Quad Lock Fork Stem Mount if your motorcycle has an open fork stem tube; use the included expanding clamps to match your tube diameter. If your tube is too large or you need extra fitting flexibility, add the Replacement Fork Stem Mounts Spacer Set to get a secure fit.
Fork Stem Mount vs. Handlebar Mount: What's the Difference?
A fork stem mount installs directly into the hollow tube of your motorcycle's steering stem, keeping the handlebar area clear. This is ideal for bikes with limited handlebar space or for riders who prefer a centered, low-profile phone position. In contrast, a handlebar mount clamps around the bar and may interfere with controls or cables.
The trade-off: fork stem mounts require your bike to have an accessible, open fork stem tube. Not all motorcycles have this—some have a solid stem or a top nut that blocks access. Check your bike's steering stem before buying.
Understanding the Expanding Clamp System
The Quad Lock Fork Stem Mount uses expanding clamps with o-rings to grip the inside of the fork stem tube. The mount comes with two clamps: a small clamp for tubes 12.4mm to 19mm in diameter, and a medium clamp for tubes 18.6mm to 25.4mm. This covers most common motorcycle fork stem sizes.
If your tube falls outside these ranges—for example, a very narrow vintage bike or an oversized aftermarket stem—you may need the Replacement Fork Stem Mounts Spacer Set. That set includes the same two clamps plus a center moto nut, giving you extra parts to fine-tune the fit or replace worn components.
Compatibility with Your Phone and Case
Both the standard Fork Stem Mount and the PRO version are compatible with all Quad Lock Cases and the Universal Adaptor. This means you can use the same mount with different phones by swapping cases, or attach a device that doesn't have a dedicated case using the universal adaptor.
The patented dual-stage locking mechanism keeps your phone secure during rides, and the quick attach/detach design means you can remove your phone without fumbling. No special tools are needed for daily use.
Decision Rules: Which Fork Stem Mount Should You Choose?
- Check your fork stem tube diameter: Measure the inside diameter of your motorcycle's fork stem tube. If it's between 12.4mm and 25.4mm, the standard Fork Stem Mount (with its included clamps) will likely fit. If it's outside that range, you may need a different mounting solution. Measure twice; the included clamps cover most bikes but not all.
- Decide between standard and PRO: The standard Fork Stem Mount is sufficient for most riders. The PRO version offers additional vibration damping and a more robust build for off-road or heavy-vibration bikes. If you ride on rough terrain or have a high-vibration engine, consider the PRO.
- Assess if you need the Spacer Set: Buy the Replacement Fork Stem Mounts Spacer Set if: your tube diameter is near the clamp limits and you want extra fitting options, you need a spare center moto nut, or you want to replace worn o-rings or clamps. The set gives you both clamp sizes plus the nut. The spacer set is a low-cost insurance for a perfect fit.
Product Facts at a Glance
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Motorcycle - Fork Stem Mounts: The Quad Lock Fork Stem Mounts are designed for motorcycles that require mounting in the tube of the fork stem. Both mounts are compatible with all Quad Lock Cases and the Universal Adaptor. You can use the same mount across multiple phones or devices as long as you have the right case or adaptor, saving you from buying a new mount for each phone.
Motorcycle - Fork Stem Mounts
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Replacement - Fork Stem Mounts Spacer Set: The Replacement Fork Stem Mounts Spacer Set includes small and medium expanding clamps plus a center moto nut, covering tube sizes from 12.4mm to 25.4mm. If your fork stem tube is at the edge of the standard clamp range or you need spare parts for a secure fit, this set gives you the flexibility to get it right.
Replacement - Fork Stem Mounts Spacer Set
Who Should Use a Fork Stem Mount?
Best For
- Riders with limited handlebar space who want a clean, centered phone mount
- Motorcycles with an accessible hollow fork stem tube (check your bike's specs)
Not For
- Bikes with a solid fork stem or a top nut that blocks access
- Riders who prefer a handlebar-mounted phone for easy reach without removing the mount
