43
(
)
0.25
d
+ 3400 - (50 d
c)
x
x
2
x
L =
(
)
0.25 539
+ 3400 - (50 539 0.707)
x
2
x
x
L =
It is not permitted to radially lace wheels built with a
, because the drive force is
delivered through this wheel.
Rohloff SPEEDHUB 500/14
Due to the large spoke hole circle diameter of the
the entrance angle between the
spokes and the rim is considerably small. All 26" and 28" wheels must not be built in more than a 2x lacing
pattern. All wheels smaller than 26” (24” and under) are only permitted to be laced in a 1x pattern.
Rohloff SPEEDHUB 500/14,
Calculating the spoke length (32 + 36):
The formula below can be used to calculate the correct spoke length should your rim ERD not listed in the table.
d: effective rim diameter in mm
c = 0.924 with 1 cross pattern (32 hole)
c = 0.707 with 2 cross pattern (32 hole)
c = 0.940 with 1 cross pattern (36 hole)
c = 0.770 with 2 cross pattern (36 hole)
Effective rim diameter: d = 539mm; 2 cross pattern:
c = 0,707
Calculation example with 32 spokes:
Spoke length:
L = 238,69mm (always round up/down to the nearest even number. Here: 238mm)
Spoke length:
A T T E N T I O N
The wheel
Nipple eyelets are currently being reduced in size to save as much heavy steel as possible in the construction. In
cases such as these, the nipple is however hindered from aligning itself correctly for lacing large flange hubs
and this results in a small kink in the spoke where it joins the nipple. This will lead to premature spoke failures
at the kink.
For this reason, rims should be used where the rim eyelet has an inner diameter of at least 4.4mm, or if possible,
rims should be used which are angularly drilled.
A T T E N T I O N
44
K
S
X
Determing the effective rim diameter (ERD)
Should the effective rim diameter need to be measured because the rim was not listed in the previous
table, the following steps can be used to determine this:
- Measure the head height
of the spoke nipples that ar e intended for use.
- Measure the spoke length
from beginning of the thread to the inside of the 90° bend.
- Thread a spoke through the rim and screw the nipple onto this so that the end of the spoke is level with
the head of the spoke nipple.
- Place a second spoke through the spoke hole of the opposing side of the rim and screw the nipple onto
this spokein the same way.
- Pull these two spokes together and measure the distance .
The effective rim diameter can now be determined using the formula:
K
S
X
d = 2 S + X - 2 K
x
x
S
poke
Spoke nipple
Rim
The wheel
