Decathlon BTWIN User Manual And Guarantee page 18

Removing or installing the wheel fixing system
- open the brake pad (see the Brakes section)
- turn in the quick fastener lever from Closed to Open.
CLOSE OPEN
OPEN
- correctly position your fork on the
CLOSE
fastener.
SAFETY RING
HUB NUT
- turn the quick fastener from Open to Closed.
The force should be sufficient to block your wheel.
Warning :
Before use, lift the wheel from the ground and hit the wheel firmly downwards
(front wheel and then back wheel). The wheel should not come away
completely untightened. In case of uncertainty, tighten again.
You should feel strong resistance lowering the quick fastener lever: the wheel is
then properly assembled.
Warning :
It is extremely dangerous to remove or damage the fastener bolt and an
addition of these two would lead to damage and falls. It may also cancel the
guarantee.