WinterRider wrote:My interest in radial lacing rear FH's stems from my 3 triplet builds to date. First two feature NDS radial heads in... 36H and 24H in 26".
The last not a true triplet I guess.. 28H going 18-10. Came about only as the lightly used rim (Kinlin generic I believe.. low 400's grs) and new Shimano hub (lower end) were sitting here. IMO the 24H triplet in 700 isn't enough for my weight.. hence this assembly for an experiment/trial. To maximize tension balance I laced it heads out.. tension both side runs in the low 120's kgf range... fairly evenly balanced around the wheel.
I find the triplet concept interesting... time will tell riding though how practical it is at my weight level. Has added a good deal of interest for me building.. chasing our winter AWAY...
Sapim Strong spokes btw. Not WW.. but suit this trial I thought.
Hi WinterRider, I had an idea about your 18-10 lacing arrangement
Have a look at the following using a CK R45 32H 8/9/10spd hub and Stans Alpha 340 28H Rim ERD = 591mm ...
CK R45 32H 8/9/10spd hub, 130mm OLD, flange Ø = 51mm/51mm, CTF = 18.9mm/34.6mm
DS - 3xDS ... Bracing Angle = 3.8 degrees, 2xDS ... Bracing Angle = 3.9 degrees
NDS - 2 x 5 spoke Crows Foot lacing (with the 2 radial spokes heads out, the others heads in (good to very good torque control) ... Bracing Angle = 7.3 degrees
Total Bracing Angle (TBA)
- 3xDS ... 3.8 + 7.3 = 11.1 (good lateral wheel stiffness, very good control of torque effects)
- 2xDS ... 3.9 + 7.3 = 11.2 (good lateral wheel stiffness, good control of torque effects)
NDS ratio ... with these figures, DS spoke tension could be 90kgf
- 3xDS ... 52% * 18/10 = 93.6%
- 2xDS ... 53% * 18/10 = 95.4%
Using the above as an example, you could build a rear wheel like this (depending on TBA, which indicates lateral stiffness) using Sapim Laser or cxray spokes, Campagnolo or Miche Racing Box or Novatec F482SB/F162S or BHS SL211B or Shimano or Hope or Bitex hubs, and almost any Rims ...
Like NDS ratio, a rear wheel needs sufficient lateral stiffness for a riders weight and/or power. Although as a riders weight/power increases so does wheels lateral stiffness need to increase from average to good to very good to excellent
It would appear that TBA reflects lateral stiffness, or until proven otherwise , where ...
- very bad < 10.0 degrees (very light rider/low to good power or light rider/low power)
- bad >= 10.0 and < 10.5 degrees
- average >= 10.5 and < 11.0 degrees
- good >= 11.0 and < 11.5 degrees (very light rider/very high power or light rider/very high power or normal rider(75/85kg)/high power or heavy rider/low to good power)
- very good >= 11.5 and < 12.0 degrees
- excellent >= 12.0 and < 12.5 degrees (heavy rider/high power)
- very excellent >= 12.5 degrees (heavy rider/very high power or very heavy rider/low to good power)
What do you think ...