@mattw433 - good question. On your
Cube Stereo Hybrid One44 HPC Race 800 2026 the answer comes down to one thing: the top-tube shape in the clamp zone. Here's how the Shotgun Pro fitment works so you can check yours.
The Shotgun Pro fitment rules
The Pro mounts to the top tube and down tube via rubber-lined clamps. It fits frames with:
• A reasonably straight, round-ish top tube section near the head tube
• Top tube diameter roughly 35–80mm
• No cable routing, remote levers or accessory mounts in the clamping zone
• Enough clearance between the top tube and down tube for a small rider to sit
Where eMTBs get awkward
•
Heavily shaped/boxy carbon top tubes (Specialized Levo/Kenevo, Trek Rail, some Orbea Wild frames) — the clamps don't always seat cleanly on the flat/ovalised sections. Some work, some don't.
•
Integrated displays or remotes on the top tube (Bosch Kiox 300/500, Specialized MasterMind TCU) — these often sit exactly where the front clamp wants to go. You may need to relocate or remove temporarily.
•
Internal cable ports right behind the head tube can foul the clamp.
•
Sloping or kinked top tubes — the seat platform may end up too high or angled awkwardly for a small child.
Adapters
Kids Ride Shotgun sell a few accessories that often help on eMTBs:
•
Shotgun Pro Handlebars — mini bars that mount to your stem so the child has something to hold. Worth getting.
• They don't sell a frame adapter as such — the rubber shims in the box are the fitment solution.
What to do
1. Measure your top tube diameter at the head-tube end and roughly 200mm back.
2. Check there's nothing in the clamp zone (display, cables, bottle bosses).
3. Kids Ride Shotgun has a
fit checker on their site — search your exact bike/year. It's reasonably accurate.
4. If in doubt, email them a side-on photo of the frame; their support is good at confirming before you spend.
The Shotgun in general is a brilliant bit of kit on eMTBs — the assist makes it genuinely sustainable to ride with a 15–20kg passenger on board, which is exactly what was lacking with analogue bikes.
Since the One44 HPC is a shaped carbon frame, the top-tube profile near the head tube is the decider — measure it and run it through Kids Ride Shotgun's fit checker for that exact model/year. If you post a side-on photo of the front triangle here, I (or other One44 owners) can sanity-check the clamp zone with you.
