Recognise wheel-alignment symptoms before tyres wear out
在轮胎报废前识别四轮定位问题
Use wear patterns and straight-road behaviour without attempting DIY adjustment.
通过磨损与直路表现判断定位需求，不自行调节悬挂。
Visual diagnosis · 10–15 min · Tyre gauge, tread gauge
1. Equalise pressure first
Set all cold tyres to the placard values and remove obvious load imbalance. Pressure differences can mimic alignment pull.
先统一正确胎压
冷车按铭牌设定各轮胎压并排除明显载重不均，胎压差会模拟定位跑偏。
2. Read the tread pattern
Compare inner, centre and outer tread across an axle. Feathering or one-edge wear needs measurement, not guesswork.
读取胎面磨损
比较同轴轮胎内侧、中央与外侧磨损；羽状或单边磨损需要仪器测量。
3. Observe only on a safe flat road
Note steering-centre position and persistent pull without loosening your grip. Road crown and crosswind can create temporary drift.
只在安全平直路面观察
保持双手控制，观察方向盘中心与持续跑偏；道路横坡和侧风会造成临时偏移。
4. Inspect after impacts or parts work
After pothole impact, kerb strike or suspension/steering replacement, request alignment plus a physical inspection for bent or loose parts.
撞击或换件后检查
撞坑、撞路缘或更换悬挂转向件后，应做定位并检查是否弯曲或松动。