Redcat 505215 Problems: Wing Mount Troubleshooting
By Redcat Racing | Published: 2026-11-01
Category: Tips & Care
Diagnose common Redcat 505215 rear wing mount problems on the TR-MT8E-V2, from loosening screws to cracked plastic, and decide when a replacement is the right fix.
Quick answer
Most Redcat 505215 problems trace back to loose mounting hardware or a cracked plastic mount after a rollover. Tighten the screws first; if the plastic is split or the holes are stripped, replace the mount set rather than trying to glue it.
Why the wing mount loosens before it breaks
The 505215 mount set holds the rear wing on the TR-MT8E-V2, so it absorbs vibration and impact every run. Screws that back out slightly let the wing wobble, which puts extra stress on the plastic ears and can turn a simple tighten-up into a cracked mount. Check screw torque after any hard landing or cartwheel.
When a cracked mount is still usable
A hairline crack near a screw hole may hold for gentle running, but it will spread under wing load. If the wing stays level and the crack does not open when you flex the mount by hand, you can finish a session; otherwise swap it before the next run. Gluing a structural plastic mount rarely survives repeated impacts.
Diagnose the problem step by step
- Symptom: wing wobbles or rattles: Check the screws that attach the mount to the truck and the wing to the mount. Tighten any loose screw snugly; do not overtighten, as you can strip the plastic threads. If the wobble returns after tightening, inspect the screw holes for elongation.
- Symptom: visible crack or white stress marks in the plastic: Flex the mount gently by hand. If the crack opens or the mount feels soft, replace it with a new 505215 set. If the crack is closed and the wing sits level, monitor it and replace before the next hard bash. A cracked mount can fail mid-run and take the wing with it.
- Symptom: screw spins but does not tighten: The screw hole is stripped. A larger screw is a temporary trail fix at best; the reliable repair is a new mount set because the plastic threads are the wear point. Stripped holes mean the mount has reached the end of its service life.
- When to stop and choose another option: If the mount is intact but the wing still sits crooked, the problem is likely the wing itself or the mounting surface on the shock tower. Stop replacing mounts and inspect those parts instead. Replace the mount only when the plastic itself is damaged or loose.
Part facts
- 505215: Genuine Redcat Racing rear wing mount set, part number 505215, designed as a direct replacement for the TR-MT8E-V2. A direct-fit replacement avoids trimming or guesswork when the original plastic mount is cracked or stripped.
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