With the standard "coupler" installed the Terazoom Q/R hub is
1.77" longer
than a
Momo adapter hub. Thus bolting on the Q/R hub is equivelant to installing a 1.77" spacer.
One can also obtain a version of this quick release hub which is only
1.27" longer than a Momo adapter hub.
As a third option there is
a longer coupler available which adds 0.5" to the standard stack height. This yields a
relatively large effective spacer size of
2.27"
for drivers who want the steering wheel very close (or drivers who sit very far back).
The longer coupler is shown below.
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