http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: 21.16mm stem en Thu, 25 Jun 2026 00:20:33 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=11331#post-127914 Thu, 10 Oct 2013 16:47:12 +0000 allebong 127914@http://citycyclingedinburgh.info/bbpress/ <p>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.</p> <p>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. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11331#post-127908 Thu, 10 Oct 2013 16:15:01 +0000 kaputnik 127908@http://citycyclingedinburgh.info/bbpress/ <p>Would a 21.1mm stem be ok? Will that 0.06mm matter that much? </p> <p>Seem to be plenty on fleabay. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=11331#post-127906 Thu, 10 Oct 2013 15:49:54 +0000 allebong 127906@http://citycyclingedinburgh.info/bbpress/ <p>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.</p> <p>As I could really use to get this bike going ASAP I really have only 2 options:</p> <p>-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.</p> <p>-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 <em>think</em> I recall seeing a BMX one in a bikestation drawer, but it needs to be both the stem and the expander <a href="http://www.jejamescycles.co.uk/product-images-large/diamondback-power-clamp-211mm-bmx-quill-stem-35983.jpg">like this</a>. It'll look bizarre on the bike but frankly appearance has never mattered much to me.</p> <p>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. </p>