4-BOLT THREADED CHAIN RINGS RENNEN
Rennen was the first to introduce Integrated Chainring bolt nuts on our
110mm BCD chairings, Now you can get the same great innovation for
our 104BCD 4 bolts. With our newest Chainring innovation you will never
have to use a chainring wrench again. We have machined into the gears
the internal Threads increasing accuracy and eliminating the frustration.