Take the 2-minute tour ×
Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It's 100% free, no registration required.

I know that most commonly MTB's use 1 1/8" steerers and older non-suspension bikes use 1" but I don't really know anything about the width of modern road bikes. Do they now use 1 1/8" or do they use a different width?

share|improve this question
add comment

3 Answers 3

up vote 8 down vote accepted

Most modern bicycles, be they road or mountain, use 1 1/8" threadless headsets. You will occasionally find bicycles, particularly in the lower cost ranges, that will still use an old 1" threaded headset and a threaded quill stem, but these are becoming more and more rare every year.

share|improve this answer
2  
There are also some oversided headsets (1.5in) used in downhill / freeride mountain bikes. They are not too common outside of this niche. –  Benzo Jun 19 '13 at 19:32
add comment

Tapered 1.125/ 1.5 inch head tubes are common on many higher end mountain bikes in 2013 with more bikes and manufacturers heading this way. Most top suspension forks are offered in both straight and tapered steerers. It is possible to use a headset that reduces bottom width in tapered head tubes to a straight 1.125 steerer.

Tapered headsets improve stiffness and strength.

share|improve this answer
add comment

Tapered headsets with a larger lower bearing are becoming more common on road bikes. Doesn't make any difference to what stems fit, but if you are replacing a headset (or fork), it matters.

e.g. http://www.fullspeedahead.com/category_list/53/HEADSETS

(And 1" threadless headsets also exist. Most likely to be on an older bike that has had a new headset fitted, I suspect.)

share|improve this answer
    
On enduro and DH also, e.g. Trek Slash –  Vorac Nov 22 '13 at 9:30
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.