They are NOT. The two inboard bogies ARE "steerable". This is done to reduce the turn radius because of the length of the aircraft. As the nose wheel is turned, the body gear (the inboards) turn in the opposite direction.
The Airbus A320 has a total of 6 tyres - 4 for the main undercarriage landing gear (consisting of two 2 wheel bogies) and 2 for the nose landing gear.
The Airbus A321 has a total of 6 wheels - 4 for the main undercarriage landing gear (consisting of two 2 wheel bogies) and 2 for the nose landing gear.
The Airbus A320 has a total of 6 tyres - 4 for the main undercarriage landing gear (consisting of two 2 wheel bogies) and 2 for the nose landing gear.
The Boeing 787 Dreamliner has a total of 10 tyres - 8 for the main undercarriage landing gear (consisting of two 4 wheel bogies) and 2 for the nose landing gear.
The An-225 has a 32-wheel landing gear system comprised of two nose bogies and fourteen main wheel bogies (seven per side). Each bogie has two wheels. The link below has a great shot of an An-225 in the landing configuration.
A Boeing 737 aircraft has a total of 6 wheels. Two wheels on the front landing gear and two on each of the two main landing gears.Four (4) on the main gears (2 LH and 2 RH)Two (2) on the nose gearTotal six (6)The Boeing 737 has a total of 6 wheels - 4 for the main undercarriage landing gear (consisting of two 2 wheel bogies) and 2 for the nose landing gear.
The Airbus A330 has a total of 10 wheels - 8 for the main undercarriage landing gear (consisting of two 4 wheel bogies) and 2 for the nose landing gear.
Attached to a gear are many tires. The tires are used the land the aeroplane. That is why it is called landing gear.
On the Landing gear
It is just called 'landing gear'
1-tricycle gear 2-conventional gear 3-unconventional gear 4-tail wheel landing gear
All of the landing gear on the particular aircraft.