A standard 'commando'
style alloy bumper weighs 17 kg (37.4 lbs). Even the
top decorative rubber from chassis to bumper weighs
1 kg (2.2 lbs).
REAR SUPER LIGHT
< Picture - For the track only, source a 1981-on bumper and use the plastic outer shell. Discard the alloy. The ultra-light 240 plastic bumper shell weighs only 2.3 kg (5 lbs). Make alloy rods to screw into standard body M8 threaded nuts. Fits quite nicely.
FRONT BUMPER UPGRADE
Front bumper (incl. spoiler)
- 'commando' 16 kg (35.2 lbs).
The later 240 model alloy / plastic front bumper with spoiler can be fitted to replace the 'commando' unit. This involves just a few fitting hours. Purchase the spoiler and support arms that insert into chassis, plus the tow hook as its much shorter. Comes close to fitting straight on, do some filing of the arm slots to get optimum height against rubber strip. Need to trim existing rubber strip at ends only to match new bumper. On the end wings inside the plastic bumper there is a sliding clip - spray this with penetrating oil so it slides easily back and forth, and this makes it a lot easier to line up the M6 screw hole with the fender hole.
The streamlined shape makes the effort worthwhile. With both front and rear upgrades, the car is approx 4" (100 mm) shorter in length !!!!