Radial Drive Wheels
• Ideal for boats up to 55’ (17m) with vertical rudderposts where
cables can be led directly from the pedestal idler to the drive wheel.
•Three hub sizes to fit rudderposts from 1” (25mm) to 7” (178mm).
•Works well for boats with limited space beneath cockpit floor.
•Easy installation — split design clamps around rudderpost.
•Reduces sheave and steering friction.
•Heat Treated Anodized Aluminum Construction.
•Each Drive Wheel is Custom Bored to your exact specification.
#777-6.5 shown •Must be secured with Key, Through Bolt or Set Screws.
•Rudderstop included on single groove radials
• Larger Custom sizes or rectangular bores available
NOTE: All Radial Wheels must be mechanically affixed to rudderpost. See Tech-Tip pg 25.
Radial Drive Specifications
#800-8 shown
Part No.
777
800
802/804
Size
6.5
8
10-15
8
10-15
8-10
12-16
A = Hub Thickness
in (cm)
17⁄8 (4.8)
15⁄8 (4.1)
21⁄4 (5.7)
15⁄8 (4 1)
21⁄4 (5.7)
2 (5.1)
23⁄8 (6.1)
Dual Groove Radial
for Twin Wheel Boats
1
⁄4”-20 S.S. bolts and nuts are
supplied and must be installed.
# 804-8 shown
1) If pedestal is forward of the
rudderpost, use the #776AL
Idler and cross the cables inside
the pedestal for proper steering
direction.
2) Boats with high rudder loads require
independent rudderpost stops.
3) Max. keyway size is the maximum
keyway that can be
used with the maximum bore.
4) Use #684 stainless keys only.
5) 1⁄4”-20 stainless bolts and nuts are
supplied and must be installed in the
holes supplied on the outside of the
radius.
6) For additional Radial Drive
installation instructions, see Edson
Steering Installation Guide.
NOTE: Measurements
are based on
use with #776AL4” Idler, minimum
distances are for
4” sheaves (add
2” for 6” sheaves).
Greater distances
are possible – contact
Edson.
#777, 800 & 802 require two #618 Take-Up Eyes.
#804 may require four #618 Take-Up Eyes.
Place nuts on same side and tighten together.
# 802-10 shown
Te c h T i p
B = Offset or Dish
in (cm)
11⁄4 (3.2)
15⁄8 (4.1)
13⁄8 (3.5)
15⁄8 (4 1)
13⁄8 (3.5)
Flat
Flat
All single groove Radial Drive Wheels are
supplied with #862-2 Rudder Stop.
See #862 on price page for replacement and
additional sizes of rudderstops.
Radial Drive ordering Guide
Replacement Stainless
Rudder Stop - Order
#862-2
Tether-Style Rudder
Stop* - Order #862-wire
* Customer supplied wire.
Order
#
777-6.5
777-8
777-10
777-12
777-15
800-8
800-10
800-12
800-15
802-8
802-10
802-12
804-8
804-10
804-12
804-14
804-16
Boat Size
L.O.A.
feet
to 30
to 35
36-41
42-48
48-55
to 35
36-41
42-48
48-55
to 35
36-41
42-48
to 35
36-41
36-41
42-48
36-41
Drive Wheel
Radius
in (cm)
6.5 (16.5)
8 (20.3)
10 (25.4)
12 (30.5)
15 (38.1)
8 (20.3)
10 (25.4)
12 (30.5)
15 (38.1)
8 (20.3)
10 (25.4)
12 (30.5)
8 (20.3)
10 (25.4)
10 (25.4)
12 (30.5)
10 (25.4)
Outside
Diameter
in (cm)
13 (33.0)
16 (40.6)
21 (53.3)
25 (63.5)
30 (76.2)
16 (40.6)
21 (53.3)
25 (63.5)
30 (76.2)
17 (43.2)
21 (53.3)
25 (63.5)
16.5 (42)
20.5 (52.1)
25 (63.5)
29 (73.6)
33 (83.8)
Pilot
Bore
in (cm)
15
⁄16 (2-3)
15
⁄16 (2.3)
1.5 (3.8)
1.5 (3.6)
1.5 (3.8)
2.5 (6.4)
33⁄8 (8.6)
33⁄8 (8.6)
33⁄8 (8.6)
33⁄8 (8.6)
43⁄8 (11.1)
43⁄8 (11.1)
solid
solid
solid
solid
solid
Max
Max Size
Bore
Keyway
in (cm)
in (cm)
3
3 (7.6)
⁄8 (.95)
3
2.5 (6.4)
⁄8 (.95)
1
⁄2 (1.3)
33⁄8 (8.6)
1
⁄2 (1.3)
33⁄8 (8.6)
1
⁄2 (1.3)
33⁄8 (8.6)
3
⁄8 (.95)
3.5 (8.9)
1
4.5 (11.4)
⁄2 (1.3)
1
4.5 (11.4)
⁄2 (1.3)
1
4.5 (11.4)
⁄2 (1.3)
3
6 (15.2)
⁄8 (.95)
3
6 (15.2)
⁄8 (.95)
3
7 (17.8)
⁄8 (.95)
3
⁄8 (.95)
4 (10.1)
3
⁄8 (.95)
4 (10.1)
1
⁄2 (1.3)
7 (17.8)
1
⁄2 (1.3)
7 (17.8)
1
⁄2 (1.3)
7 (17.8)
Weight
lb (kg)
6.5 (2.9)
7.5 (3.4)
10.5 (4.7)
22 (10)
26 (11.8)
8 (3.6)
13 (5.9)
23 (10.4)
27 (12.2)
14 (6.4)
16 (7.3)
23.5 (10.7)
8 (3.6)
12 (5.4)
20 (9)
34 (15.4)
40(18)
NOTE: Selection Guide is to be used with specific recommendations approved by your naval architect.
1.508.995.9711
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