RIDLEY Bicycle Use And Maintenance Booklet page 23

(2) While pushing the wheel firmly to the top of the slots in the fork
dropouts, and at the same time centering the wheel rim in the fork,
use a six-inch adjustable wrench or a 15mm box wrench to tighten
the axle nuts as tight as you can.
(3) Close the brake shoes; then spin the wheel to make sure that it is
centered in the frame and clears the brake shoes.
6.1.4.c. Removing a Bolt-On Rear Wheel
(1) Open the rear brake shoes (see
Section 6.3.1, Figs. 16a, b, c and d).
(2) Shift the rear derailleur to high gear
(the smallest rear sprocket) and pull the
derailleur body back with your right
hand.
(3) With a 15mm box wrench or a six-inch adjustable wrench, loosen
the two axle nuts.
(4) Lift the rear wheel off the ground a few inches and, with the
derailleur still pulled back, push the wheel forward and down until it
comes out of the rear dropouts.
6.1.4.d. Installing a Bolt-On Rear Wheel
(1) Shift the rear derailleur to its outermost position and pull the
derailleur body back with your right hand.
(2) Put the chain on to the smallest sprocket. Then, insert the wheel
into the frame dropouts and pull it all the way in to the dropouts. The
axle nut washers should be on the outside, between the frame and
the axle nut.
(3) Tighten the axle nut as tightly as you can, using a six-inch
adjustable wrench or a 15mm box wrench.
(4) Push the rear derailleur back into position.
(5) Close the brake; then spin the wheel to make sure that it is
centered in the frame and clears the brake shoes.
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