CyberRear SPT wheelbuilding
Here you find all the necessary instructions to realize your dream wheels with precalculated spoke lengths.
Follow instruction step by step:
1)Measure your "spokeend diameter"
2)Find your rear radial spoke length (left side) on table A
3)Check your rim for compatibility and hole distance, if uneven see correction factor
4)Find your rear spoke length (drive side) on table B and eventually apply correction factor
Rim
offset:
(normally 2  3mm) influences the spoke length for an average 0.3mm.
You may neglect it or eventually use that tiny amount just for rounding lengths
to the available spoke size.
(All measures are expressed in mm)
Maximum spoke tension: Refer to manual
Warning:
spoke lacing and tensioning require skills and experience,refer to an expert
professional wheel builder for these operations.
1)"spokeend diameter"
Rim manufacturers always offer ERD figures however we warmly recommend to precisely measure the rim+nipple combination.
Basically
a correct spoke calculation requires exact "spokeend diameter" and rim drilling.
Spokeend
diameter depends on your rim internal diameter and nipple type.
How to measure "spokeend diameter"
2)CyberRear SPT
Left side  Radial lacing  Straightpull spokes
Spokeend
Diameter

Spoke
Length

500

238

505

240

510

243

515

245

520

248

525

250

530

253

535

255

540

258

545

260

550 
263

555

265

560

268

565

270

570

273

575

275

580

278

585

280

590

283

595

285

600

287

605

290

610

292

615 
294 
Table A
Note: We
list "spokeend diameters" every 5mm step. If your "spokeend
diameter" measure is in between 2 steps adjust your spoke length consequently.
Example 1: your "spokeend diameter" is 563mm use 269mm spoke.
Example 2: your "spokeend diameter" is 567mm use 271mm spoke.
Example 3: your "spokeend diameter" is 569mm use 272mm spoke.
3)Rim Type, correction factor
Compatible
with standard and triplet specific rims.
On standard rims spoke holes must be with vertical drilling.
Angled drillings are not compatible, spokes would bend and break.
Ceck
your rim: if distance between spoke holes are all equal go to point 4)
if the rim has
uneven hole distances a
correction factor is necessary.
Central
hole is for radial spoke, two adjacents are for drive spokes.
Measure distance between central hole and adjecent, see below.
4)CyberRear SPT
Drive side  Straightpull spokes
Eventually apply correction factor
Spokeend
Diameter

Spoke
Length
24H 
500

249

505

251

510

254

515

256

520

259

525

261

530

264

535

266

540

269

545

271

550 
274

555

276

560

279

565

281

570

284

575

286

580

289

585

291

590

294

595

296

600

299

605

301

610

304

615 
306 
Table B
Note:
We list "spokeend diameters" every 5mm step. If your "spokeend
diameter" measure is in between 2 steps adjust your spoke length consequently.
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