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Head tube size pros & cons...(5 posts)

Head tube size pros & cons...mlbd
Sep 3, 2002 4:00 AM
What are the advantages/disadvantages of the two common head tube sizes (1 inch vs 1.25 inch)? I'm thinking about get a new bike that i would use primarily for racing (road races; circuit races; no crits). The Look kg361 is tempting--on sale at Excel for $899. It has 1 inch head tube...is there a problem with that? Thanks.
re: Head tube size pros & cons...cyclopathic
Sep 3, 2002 5:07 AM
1.25? you mean 1.125 (1 1/8 inch)

1 1/8 gives 26% stiffer interface. Stiffnes on 1" isn't really a problem, maybe if you're a crit racer pushing 200lbs and need lotsa spacers on carbon steer Look fork. Other issue the 1" is being phaced out, it will be harder to find parts in 2-3 years.

1" is a great value I wouldn't worry if I were on market for new frame.
re: Head tube size pros & cons...rbb
Sep 3, 2002 5:24 AM
Actually, Chris King now makes a headset that will allow you to run a 1-1/8th" steerer tube on a 1" sized headtube. They also make one for using a 1" steerer tube on a 1-1/8th" sized headtube. So, even if in a couple years you need a new fork, you should be okay!! Good luck!
Take care

-Bob
re: Really..........Rusty Coggs
Sep 3, 2002 5:40 AM
what's it called and where do I find one?
sure about that??C-40
Sep 3, 2002 8:33 AM
CK makes the "Ddevolution" headset that allows a 1" steering to be used on a frame made for a 1-1/8".

Using a 1-1/8" (28.6mm) steering tube on a frame made for a 1" steering tube is a different matter. The head tube ID is only 30.2mm. To put a 28.6mm steering tube in this head tube, the cup skirt thickness would have to be less than .8mm (1/32"). Too thin for aluminum and marginal even if it were steel. I see no such product listed on the CK website.