18.
19.
dropout systems
Use a 5mm allen key to loosen the two
m8x17mm bolts holding the standard drive side
Big top dropout in place. remove the bolts and
the dropout from the frame. repeat the process
for the bolts and drop out on the non-drive side.
Fit a dropout insert into each of the two grooves
on the inside of the drive side single speed drop.
next, slide the drive side mount over the two
inserts and into the dropout. this assembly fits
flush onto the inside of the drive side chain stay.
attach the assembly from step number two to the
frame with two m6 shoulder bolts prepped with
washers and blue loctite. Use a dropout plate
between the bolts and the outside of the chain
stay. tighten the bolts so that the dropout can
still slide on the mount, they will be torqued to
spec later in the assembly. repeat steps two and
three for the non-drive side components.
place the rear wheel in the dropouts and slide
the drops to the desired chain stay length (17.3”
to 18.0”). install a m5x50mm cap bolt with a m5
jam nut into each drop out. adjust these bolts
with a 4mm allen key to ensure both dropouts are
square, the rear wheel is centered in the frame,
and chain tension is correct. lock the cap bolts
in place by tightening the jam nuts against each
dropout.
01. single speed drops
02. single speed drops
04. single speed drops
03. single speed drops
tighten the two m6 shoulder bolts on the drive
side dropout with a 5mm allen key. repeat the
process for the non-drive side.
torque to 70-75 in/lb.
Double check that the dropouts are square and
the rear wheel is centered in the frame. when
assembling the Big top as a single speed for
the first time it will be helpful to set the chain
stay to the desired length before measuring and
cutting the chain. this will help ensure proper
chain tension for the bicycle. when making a
large adjustment of the chain stay length after the
bicycle is assembled be aware that a change to
the chains length may be necessary.
05. single speed drops
06. single speed drops
dropout systems
