AHEADSETS Vs CONVENTIONAL NUT HEADSETS
AHEADSETS 1 1/8"
with 5/32" race bearings
AHEADSETS great aren't they. Only need a 5mm allen key to adjust.
The only items that could get overtightened/cross threaded/rounded off/worn are:
~ LOCKING NUT WASHERS & TOP CAP ALLEN KEY BOLT
~ AHEADSET STEM & ALLEN KEY BOLTS
~ BEARINGS in a race
The above are relatively inexpensive items, well a stem at the greatest still isn't alot.
CONVENTIONAL NUT HEADSETS 1", 1 1/8" or 1 1/4"
(Aka EVO, I guess the principal of this term, probably came about because larger diameter has more threads overall hence would need more force to come undone , and also would need larger flat plate spanner to adjust, HEAV HO, etc).
CONVENTIONAL NUT HEADSETS are adjusted with flat plate spanners (Or adjustable wrench, or molegrips!).
(Still found on really cheap MTB's, you know APOLLO, TRAX, GEMINI, etc)
These headsets have with a bottom and top locking nut, these often became loose.
The items that could get overtightened/cross threaded/rounded off/worn are (& often did):
~ the headsets (Top nut & bottom nut)
~ fork steerers
~ BEARINGS in a race
Hence worn out threads on both:
~ fork steerer (If possible. I.E. If fork steerer isn't replaceable, then replace FORK!) and
They would have to be replaced, and that isn't cheap, especially when compared to aheadset.
NOTE of POSTERITY: Years ago when ALUMINIUM frames became popular oversized tubing started to get popular, hence headtube diameter increased, so 1" would be too small, so 1 1/4" (EVO) was introduced, these were popular on CANNONDALE and ALPINESTAR. In fact my old CANNONDALE had an EVO headset, I put in reduced sized cups (1 1/4" to 1 1/8") in AHEADSET, so I could fit front suspension.
NOTE: EVO is short (An abbreviation) for EVOLUTION, aka the biggest known headset, that was common (20 years ago, circa 1991, when I was young teenager at 14) amongst aluminium frames with oversized tubing. An oversized head tube was used, because oversized downtube and top tube welded to an 1" headtube would have been a bad (Insufficient) fit. Today in the early 20th century (2011), the 1 1/8" headset is the STANDARD.
Also for OBLIGATORY purposes, photos of my AHEADSET TOP CAP (TIOGA) and AHEADSET STEM (KORE).
my AHEADSET TOP CAP ("TIOGA")
my AHEADSET STEM & TOP CAP aerial view ("KORE" & "TIOGA")
my AHEADSET STEM side view ("KORE")
Giant Trance x1 ~ 2008