UltraHubs SPD / HyperLefty

wheel-building

Here you find all the necessary instructions to realize your dream wheels with pre-calculated spoke lengths.

Follow instruction step by step:

1)Measure your "spoke-end diameter"

2)Find your front spoke length on table A & B

3)Find your rear spoke length on table B

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)


Warning: spoke lacing and tensioning require skills and experience,refer to an expert professional wheel builder for these operations.

1)"spoke-end 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 "spoke-end diameter" and rim drilling.

Spoke-end diameter depends on your rim internal diameter and nipple type.

How to measure "spoke-end diameter"

 

2)UltraFront SPD / HyperLefty

Radial lacing - Straight-pull spokes

Spoke-end Diameter
Spoke Length
26' Rims
  
515
244
520
246-247
525
249
530
251-252
535
254
540
256-257
545
259

550
261-262
555
264
560
266-267
29' Rims
  
580
276-277
585
279
590
281-282
595
284
600
286
605
289
610
291

Table A

Note: We list "spoke-end diameters" every 5mm step. If your "spoke-end diameter" measure is in between 2 steps adjust your spoke length consequently.
Example 1: your "spoke-end diameter" is 553mm use 263mm spoke.
Example 2: your "spoke-end diameter" is 548mm use 260mm spoke.
Example 3: your "spoke-end diameter" is 549mm use 261mm spoke.
Example 4: your "spoke-end diameter" is 550mm use 261 or 262mm spoke.

 

UltraFront SPD / HyperLefty

Crossed sides - Straight-pull spokes

Spoke-end
Diameter
Spoke Length
28H
Spoke Length
32H
26' Rims
    
515
261-262
256-257
520
264
259
525
266-267
261
530
269
264
535
271-272
266
540
274
269
545
276-277
271

550
279
274
555
281-282
276
560
284
279
29' Rims
580
294
288-289
585
296
291
590
298-299
293-294
595
301
296
600
303-304
298-299
605
306
301
610
308-309
303-304

Table B

Note: We list "spoke-end diameters" every 5mm step. If your "spoke-end diameter" measure is in between 2 steps adjust your spoke length consequently.

 

 

3)UltraRear SPD

Crossed sides - Straight-pull spokes

Spoke-end
Diameter
Spoke Length
28H
Spoke Length
32H
26' Rims
    
515
261-262
256-257
520
264
259
525
266-267
261
530
269
264
535
271-272
266
540
274
269
545
276-277
271

550
279
274
555
281-282
276
560
284
279
29' Rims
580
294
288-289
585
296
291
590
298-299
293-294
595
301
296
600
303-304
298-299
605
306
301
610
308-309
303-304

Table B

Note: We list "spoke-end diameters" every 5mm step. If your "spoke-end diameter" measure is in between 2 steps adjust your spoke length consequently.

Lacing: correct lacing patterns with straight-pull spokes must be tangential, as shown below (and not as the traditional 2 or 3 crossings used for elbow spokes)

 

 

 

100% made in Italy