Eyelets aren't necessary or even desirable on a v-section rim like the Dyad because the force of spoke tension is pulling along the plane of the rim wall (approximately) and the metal at the apex of the V, where the spoke holes are, is extra thick. Eyelets are desirable/necessary on box-style rims like the Synergy because the forces of the spoke tension are pulling against the rim wall at a right angle (approximately). Weight isn't necessarily a good indicator of wall thickness or strength in this case, since the rims are a completely different shape and the stress distributions are different.
Anyway, I have quite a bit of experience with Dyads (700c) and Aeroheats (26"), both personal and with wheels I've built for other people. Ken Yokanovich is the only guy I know who breaks them, but Ken is an extraordinary case. The Synergy is a decent rim, but the old box design is inherently weaker with respect to spoke tension, and I have seen how they come apart under heavy loads. If the spokes don't break and the eyelets don't pull through, the inner wall actually separates from the outer wall and brake walls. IMO, this is a design disadvantage of eyeletted, box rims in general. I've seen the same out of CR-18s, Super Champions, and some eyeletted Mavic and DT-Swiss rims. On Mar 3, 7:09 pm, "Bill M." <[email protected]> wrote: > Jim, > > What would make the Dyad better for heavier loads? Based on the specs > in 700c, the Dyad is a little wider and deeper than the Synergy but is > also a tad lighter, which implies thinner walls, and the Dyad lacks > eyelets. I've used the Dyad in 26" (where it's labeled as the > Aeroheat) and it was a fine and sturdy rim, but I'd probably trust the > thicker walled, eyeletted Synergy rim with a little higher spoke > tension and that should build a stronger wheel. > > As a reference point for the OP, I weigh 175+ and ride Aeroheads (much > lighter rims) with 28 mm tires with no problems. I also have a set of > the budget Riv 650b wheels, but haven't yet ridden them enough to have > an idea of their durability. I'll get back to you on that in a few > years. In the meantime, if you're expecting to punish those wheels, > spring the extra cash for a set with 36 butted spokes. They should > hold up better than 32 plain gauge spokes, without much of a weight > penalty. > > Bill > > On Mar 2, 10:02 pm, Jim Thill - Hiawatha Cyclery <[email protected]> > wrote: > > > As a point of reference, I built a similar set of wheels (32h, Synergy > > rims, LX or XT hubs) for a Bleriot a few years ago. The guy who rides > > it is probably 250, and started using the bike to carry heavy > > commuting loads and for loaded touring/camping trips. Last summer on > > the final leg of a week-long tour, during which, I gather, the bike > > was HEAVILY loaded over some not-so-smooth roads, the rim came apart > > in several places. No spokes were broken, so I simply moved the > > existing spokes over to a new rim and got the bike back on the road > > with minimal expense/hassle. > > > In the not-too-distant future, you'll be able to get Velocity Dyad > > rims in 650B. Those will be better for heavier riders, IMO. > > > On Mar 2, 7:42 pm, Dead Mike <[email protected]> wrote: > > > > That's true and like many things Riv, its probably higher quality than > > > some of the stuff I've already been riding on. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en -~----------~----~----~----~------~----~------~--~---
