- E21 Chassis: The E21 was built on a separate chassis, not unitary construction like most modern cars, which gave it a more traditional feel.
- Length and Width: It measures 4,420 mm (173.6 in) long, 1,680 mm (66.1 in) wide, and has a wheelbase of 2,550 mm (100.4 in).
- Weight: The E21 was relatively light for its class, with the average weight being around 1,120 kg (2,470 lb), thanks to extensive use of steel.
- Engine Options: Initially, it came with a choice of four-cylinder engines: 1.6L M47/48 and 2.0L M10 variants. The latter was more powerful and featured in higher trim levels.
- Transmission Choices: It offered three transmissions: a five-speed manual (M21/25), a four-speed automatic, and an optional SM22 semi-automatic for the more expensive models.
- Suspension and Brakes: The front suspension used MacPherson struts with coil springs, while the rear had semi-trailing arms and coil springs on both sides, along with disc brakes all around.
- Wheels and Tires: Standard equipment included steel wheels with wheel covers, though 14-inch alloy wheels were optional for more sport-oriented models, accompanied by Michelin TRX tires in some configurations.
- Fuel Economy: The E21 boasted average fuel economy figures of about 12 liters per 100 kilometers (19 mpg) under normal driving conditions for the smaller engines.
- Safety Features: While not a focus area at its inception, it did feature driver and passenger airbags in some models and had high-strength steel to protect occupants during impacts.
- Production Volume: Over the course of its lifespan from 1975 to 1982, BMW produced approximately 745,000 units of the E21 series.
- Emissions Compliance: The engine's design was optimized for low emissions in compliance with strict European standards at the time, especially after a major overhaul in 1978 for better smog control.
- Performance Variants: Performance models included the 323i (2002 cc) and the rare M20 powered E21s like the 324d turbocharged model and the limited production 320 Turbo.
- Interior Features: The interior featured a wood dashboard on more expensive trim levels, along with vinyl seats in many configurations to save weight and cost.
- Rear Spoiler: A rear spoiler could be ordered as an option for some models, adding a sportier look while also improving high-speed stability.
- Special Editions: There were several special edition E21s produced during its run, each with unique trim levels or performance upgrades, such as the Alpina C2 and C3 models which featured upgraded engines and interior components.
- Restoration Parts: Due to its age and popularity among enthusiasts, BMW has released limited batches of refurbished original parts for restoration purposes.
- Community Support: The E21 has a dedicated enthusiast community with active forums, clubs, and social media groups focused on the model's preservation and enjoyment.
- Influence On Future Models: Its influence can be seen in later BMW models such as the E30 3 Series, which also featured an extensive use of steel and sport-oriented performance options.
- Resale Value: Despite being an older model, the E21 retains a significant portion of its original value due to its rarity and demand among collectors and enthusiasts.
- Restoration Tips: Due to corrosion issues common with older steel-bodied cars, proper restoration techniques emphasize thorough rust removal, metal repair, and protective coating application for longevity.
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