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6 Maintenance and adjustments
6.1 IMPORTANT! Do not attempt to open the casings of the battery, motor or
controller it could be dangerous and all warrantees will become void. If you
experience a problem contact our service department or your retailer.
6.2 Wheel spokes should be adjusted after 300 miles riding. Handlebar and saddle
tubes should never be raised beyond the maximum indicated by a safety line
around the tubes. The recommended torque on the nuts is as follows:
(A)Front axle nuts. 46N.M
(B)Back axle nuts. 70N.M
(C)Handlebar clamp bolts. 12N.M (Refer 15.1 picture)
(D)Handlebar stem expander bolt. N/A
(E) Seat pillar clamp nut/bolt. (5-8) N.M
(F)Brake cable anchor bolt. 5N.M
(G)Brake centre bolt. 11N.M
(H)Seat clamp nuts. 24N.M
(I)Crank axle nuts. R:42N.M L: 46N.M
(K) Gear shifter nuts. 4N.M
(L) V brake caliper nuts. 10N.M
(M) Rear carrier nuts. 8N.M
(N) Mudguard bracket nuts. 8N.M
Other general torque settings depend on the thread size. M4：2.5-4.0N.M M5：
4.0-6.0N.M M6：6.0-7.5N.M
6.3 Your bike has a rear derailleur that will automatically tension your chain.
However if the chain becomes loose or frequently comes off the front
chainwheel, please seek advice from your nearest Wisper dealer.
6.4 The brake leavers should lock the wheels when compressed half way between
their open position and touching the handle bars. If not please adjust following
instructions provided below.
6.5 Warning: Handlebar hand grips or tube end plugs should be replaced if
damaged, as bare tube ends have been known to cause injury.
6.6 Warning: Any replacement forks must have the same rake and same tube inner
diameter as the originally fitted to the bicycle.
6.7 Front and rear brake blocks must be replaced if the grooves are no longer
visible.
IMPORTANT braking distances increase on wet or icy roads.
6.8 Lubrication:
6.8.1. Once a month lubricate all pivot points on the derailleur with chain lube.
6.8.2. Every three months lubricate the brake lever pivots, the gears and chain
with light oil and the brake arm bushes (not the brake blocks) with a little
grease.
6.8.3 Once a year, have your dealer re-grease the headset bearings, front wheel
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