SON 29 S 12x100, Centrelock (straight pull) spoke length

Straight pull, 24 hole. Flange diameter 70.25 mm left and 37.3 mm right, centre to flange 20.63 mm left and 31 mm right. SON set the lacing on this hub, and the calculator follows it. Pick your rim in the calculator for your exact spoke lengths.

Rim

Choose the rim

ERD 591 mm, made in 24, 28 hole. Asymmetric: the spoke holes sit 3 mm off centre, allowed for in the lengths.

Washers under the nipples (optional), mm thick

Some alloy rims use them. Leave empty if you don't.

How to measure ERD yourself

Take two spokes of a known length and screw a nipple onto each until the thread end is flush with the top of the nipple. Drop them through opposite spoke holes so the nipples sit in the rim as they would in a built wheel. Pull them tight towards each other and measure the gap between the bent ends. ERD is the gap plus both spoke lengths.

Hub

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Choose the hub (46 fit this rim)

Straight pull. Flange diameter 70.25 / 37.3 mm, centre to flange 20.63 / 31 mm (left / right).

Hub not listed? Choose "Type in my hub", or tell me which one and I'll add it.

Lacing

Spoke holes

SON set the lacing for this hub. SON's tangential pattern on both sides.

SpokesSpoke type

Used for the stretch, the weight and the ping note.

Tension, tighter side, kgf

Most wheels 100 to 130. Check your rim's limit.

Spokes come in

Allow for spoke stretch (spokes stretch a little once they're tight, thin ones most)

Spoke lengths

Check your rim and hub against the maker's sizes before you order spokes.

Front wheel, 24 hole, straight-pull spokes, 591 mm ERD.

Side	Spokes	Length
Left (disc side)SON's pattern	12	294 mm293.6 worked out
RightSON's pattern	12	296 mm295.7 worked out

Rounded to the nearest mm. Between two sizes, go for the shorter one.

Tension: the right spokes run at 85% of the left side's tension. Bracing angles 4.6° left, 5.4° right.

Weight: these spokes and alloy nipples come to about 158 g (about 174 g with brass nipples).

Have me build this wheel

Order these spokes from me

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Will my spokes fit?

Left (disc side): spokes I have, mm

Right: spokes I have, mm

Nipple length

Often needed with this wheel

kLite lights for the SON
ULTRA front lights and the bar switch loom that run straight from the hub. Pick the parts in the kit builder.
Nextie tubeless tape and valves
Ready for the tyre when the wheel is built.

These lengths come from the makers' published sizes and a standard sum. Rims and hubs vary from batch to batch, and sizes you put in yourself are only as good as your measuring. Travers Bikes takes no responsibility for spoke lengths worked out with this calculator, or for spokes, wheels or parts bought or built using them.

SON 29 S 12x100, Centrelock (straight pull) with common rims

Straight-pull lengths include the hub maker's spoke offset. Rounded to the nearest mm.
	Holes	Left	Right	Lacing
Nextie Alpha 36S 29"	24	294 mm	296 mm	SON's pattern
Nextie Omega 36U 29"	24	295 mm	297 mm	SON's pattern
Nextie Omega 36 29"	24	295 mm	297 mm	SON's pattern
Nextie NXT29UM27 29"	24	296 mm	298 mm	SON's pattern
Nextie NXT29UM30 29"	24	293 mm	295 mm	SON's pattern
Nextie NXT29UM32 29"	24	293 mm	295 mm	SON's pattern
Nextie NXT29XM33 29"	24	288 mm	291 mm	SON's pattern
Nextie NXT29VM30U 29"	24	296 mm	298 mm	SON's pattern
Nextie NXT29VM35U 29"	24	293 mm	295 mm	SON's pattern
Nextie NXT29VM37U 29"	24	293 mm	295 mm	SON's pattern

Back to the spoke length calculator for how it works and how to measure your own parts.

A pair of Nextie carbon wheels built at Travers Bikes

Want me to build it?

I hand-build wheels in Rochford with Nextie carbon rims and Hope, DT Swiss, Chris King, Shimano, Nextie and SON hubs. I work out the spokes and order them, so getting the length right is my job, not yours.

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