i refers to the standard wheelbase. In other words, the wheelbase length of this BMW is within the standard wheelbase. Li stands for long wheelbase.

Range of standard wheelbase:

The wheelbase of p>A passenger cars is between 2 meters and 2.3 meters. The wheelbase of A passenger car is 2.3m to 2.5m.. The wheelbase of Class A passenger cars is between 2.5 and 2.7 meters. The wheelbase of Class B passenger cars is about 2.7 meters to 2.9 meters. The wheelbase of C-class passenger cars is about 2.8 meters to 3 meters. D-class luxury passenger cars are mostly magnificent in appearance, with extremely spacious interior space and very strong engine power, and their wheelbase is generally greater than 3 meters.

Extended information:

Influence of vehicle wheelbase on vehicle performance:

Too short and too long wheelbase will have an impact on vehicle performance.

if the wheelbase of a car is short, the length of the car will be short, the weight will be small, and the minimum turning radius and longitudinal passing radius will be small, so the mobility of the car will be good.

however, if the wheelbase is too short, the length of the carriage will be insufficient, and the rear suspension (the distance between the axis of the last wheel of the vehicle and the last end of the vehicle) will be too long, which will lead to large longitudinal swing when driving and large mass transfer when braking, accelerating or uphill, and its maneuverability and stability will become worse.

If the wheelbase is too long, the length of the car body will be increased, so the blind spot of the rear part of the car will be too large. If the parking radar is not added, parking will be a severe test for beginners.

Baidu Encyclopedia-wheelbase

Baidu Encyclopedia-BMW 3 Series