CityCyclingEdinburgh Forum » Stuff

21.16mm stem

(3 posts)
  • Started 11 years ago by allebong
  • Latest reply from allebong

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  1. allebong
    Member

    Through a long and complex series of ebay sales, bike station foraging and salvage operations I have managed to obtain a set of rigid forks with a silly 21.16mm inside steerer diameter. As the outside diameter is still 1" they are sitting happily in a headset in a frame ready to be built into a winter town hack. Thing is a standard 22.2mm quill stem doesn't fit so said bike is going nowhere fast without a compatible stem.

    As I could really use to get this bike going ASAP I really have only 2 options:

    -Find a set of 26", V brake compatible 1" threaded forks with a ~160mm steerer height and the normal 22.2mm inside measurement. Of all the forks in the bikestation none met this criteria when I checked them out last week. The forks I have just now were about £13 delivered from ebay, so I could try to find another with the right steerer.

    -Find a stem with the 21.16mm size. Apparently these were made by the millions in the 70s/80s and are still used on low end BMXes. I think I recall seeing a BMX one in a bikestation drawer, but it needs to be both the stem and the expander like this. It'll look bizarre on the bike but frankly appearance has never mattered much to me.

    So, for all of you here who have sheds full of random spare parts going back decades, it would be helpful if you might have one lying around. A rigid fork with the right spec would also be acceptable, though I'll have to double check that steerer height.

    Posted 11 years ago #
  2. kaputnik
    Moderator

    Would a 21.1mm stem be ok? Will that 0.06mm matter that much?

    Seem to be plenty on fleabay.

    Posted 11 years ago #
  3. allebong
    Member

    I think 21.16 is the exact diameter but it's commonly referred to as 21.1mm. I'll drop by the bikestation tomorrow and see what I can scrounge up. May just have to bite the bullet and get a new stem. I'd prefer to have normal 22.2mm forks on there although I'd be happy just to get the thing going. 2 bikes out of commission just now while doing the pre-winter maintenance so I'll have to scoot about on the road bike.

    Edit: While looking at the BMX stems, it occurs to me they'll probably be too short and give an odd riding position. I'll be running ~600mm bars as I normally do on town bikes so I usually go with ~80mm stem for a decent bit of reach. My mtb has a 40mm stem so I'm well used to that posture but I don't know how I'd like it for road/town use. Still, best to get it running by any means before worrying about the specifics.

    Posted 11 years ago #

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