Walshen 8.5 x 2 Bent Valve Inner Tube (50/75-6.1) — Rear Scooter Replacement, Thick Butyl 90° Stem

Walshen 8.5 x 2 bent-valve inner tube (50/75-6.1) is a thicker butyl rubber replacement tube designed for rear wheels on many 8.5-inch electric scooters, with a 90° bent stem to simplify inflation.

If your scooter rear tire needs a pneumatic replacement that fits 8.5-inch wheels (50/75-6.1), this Walshen inner tube is built to match common models like Gotrax and Xiaomi. It uses a hollow, thicker butyl construction for improved air retention, a 90° bent valve stem for easier access, and a tread profile intended to maintain traction. Before installing, confirm the valve orientation on your wheel matches the bent-stem design to ensure compatibility.

How does the bent 90° valve make inflation and maintenance easier?

The 90° bent stem positions the valve away from tight wheel wells and frames, giving you better access when adding air or checking pressure. That angle reduces the need to remove components or awkwardly reach into the hub area. It’s especially helpful on scooters with limited clearance around the wheel.

• Easier pump access without removing the wheel
• Less risk of bending the valve during inflation
• Works with standard bike pumps and portable compressors

Will this tube fit my Gotrax or Xiaomi rear wheel?

This inner tube is sized 50/75-6.1 (commonly labeled 8.5 x 2), which matches many 8.5-inch rear scooter wheels from brands like Gotrax and Xiaomi. However, compatibility depends on valve orientation and exact rim dimensions, so visually confirm that your scooter uses a rear bent-stem valve before purchasing.

• Designed for 8.5 x 2 / 50/75-6.1 rear wheels
• Compatible with many Gotrax GXL V2, XR, Xiaomi and similar scooters
• Verify your current tube’s valve stem is bent and faces outward

What performance differences does a thicker butyl tube deliver?

Walshen uses a thicker butyl formulation to reduce air loss and extend time between inflations. Thicker walls also resist punctures and pinch flats better than very thin tubes, while the hollow structure preserves flexibility for steering and braking response. Expect improved air retention and a slightly firmer ride compared with thinner replacement tubes.

• Approximately 20% better air retention than standard thin tubes
• Improved puncture and pinch-flat resistance
• Maintains ride flexibility for predictable handling

How does the tube affect grip and braking on the rear wheel?

This tube is intended for pneumatic tires with an anti-slip tread, so when paired with the correct outer tire it helps maintain traction under acceleration and braking. Pneumatic rear setups typically offer better control than solid tires, especially over uneven surfaces. Proper inflation will preserve tread contact and braking stability.

• Works with anti-slip tread tyres for reliable grip
• Better shock absorption than solid wheels for uneven ground
• Stable braking feel when maintained at recommended pressure

Who is this for: Riders who own an electric scooter with an 8.5-inch rear wheel (50/75-6.1) and need a bent-stem valve replacement for easier inflation and improved air retention. This set is useful for commuters, casual riders, and anyone replacing a punctured or worn inner tube on compatible Gotrax, Xiaomi, or similar scooter models. Make sure your current wheel accepts a 90° bent valve before ordering to ensure a straightforward swap.