For Sale: Slam that stem - low stack headset cover

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  • I had a small batch of these made, and I'm selling the ones I don't need for my/family bikes at £10 posted to UK Payment by bank transfer

    For outside the UK, PayPal payment £20 including postage for any destination served by Royal Mail "Signed For" services.

    Black anodised 6082T6 aluminium, weight about 3.1g, fits Cane Creek IS heasdets (41mm or 41.8mm bearings, 45/46/47/48mm OD head tube) replacing the typical 10mm to 20mm conical spacer/headset upper bearing cover, so you can get your stem way down low. Only 1mm of stack added above the upper bearing centring collet. You may need to add or subtract shims to get the axial clearance dialled in..

    It's designed for the common Cane Creek IS2 and clones. If your steerer is 1⅛" and your bearings are 41mm dia. 45°/36° or 41.8mm 45°/45°, it should fit, and if your head tube is 45mm dia. or 46mm or 47mm or 48mm too it will line up nicely to boot.

    To determine which size you need, refer to the instructions and diagram below.
    Measure the head tube diameter at the top. Measure the depth - to do this, assemble the headset and stem and adjust the preload, then, without lifting the front wheel off the ground (which will tend to move the steerer and thereby mess up the precise position of the compression ring) measure the depth from the top of the compression ring ③ to the top of the head tube. From this dimension, subtract 0.2-0.5mm, which is the recommended clearance, to get the required internal depth of your bearing cover. Stock depths are 2mm, 3mm and 4mm. If your result is less than 2mm, you'll want a 2mm deep cover and one or more 0.25mm shims on top of the compression ring. These shims can be found in most people's parts bin, if there aren't any in yours ask your LBS or friends.

    1 Attachment

    • upper bearing assembly no shim v1.jpg
  • PM'ed and money sent.

    I'll be fitting it to Giant's 'Overdrive Road' headset at some point. I'll let people on here know how that goes.

  • It works!

  • How big is the gap between the cover and the head tube?

  • 2mm. So not ideal.

    I've put plenty of silicon grease on the rubber seal (which is pretty good anyway).

  • Can you take some close up pics, then I can make one that fits properly next time I'm getting stuff made (which might not be very soon, but there is a growing list of jobs waiting to be done)

  • I can take another shot in tomorrow's light if that helps.

    I think it'd be perfect for this bike with another 1.5mm of depth and 1mm of diameter. The thing is Giant have since changed headsets again so anything close to a universal design for them is going to be tricky.

  • If there was a universal headset, there would be a universal cover :-)

  • I think it'd be perfect for this bike with another 1.5mm of depth and 1mm of diameter.

    Like this?

    1 Attachment

    • giant_headset_cover.png
  • Is that 45 or 46mm in diameter?

    That depth is perfect, and chamfer would easily clear the seal.

  • It's 46mm OD, chamfer on the inside is the same as the one you have, i.e. it starts at 41mm dia. and heads off at 45°

  • Then that would be the perfect fit.

  • I'll put it one the machining list. My sister in law has a 46mm head tube too, but I need to look at her bike (in Wiltshire) to see if she needs as much skirt on hers.

  • Thanks.

    Very much enjoying the lower position on the bike this morning. Climbing on the tops is better and I'm more stable in the drops as my arms are more extended.

    Thought I might get neck ache (it happens occasionally) but there was none after 100k and my shoulders felt really relaxed. I think all is good.

  • Is Ryder Hesjedal running his stem mounted directly onto the bearing here?

  • "Dat slam"



    Slammed. Cheers mdcc. As with the giant, another 1mm of depth would have it sorted for a mash.

  • Not yet, but I'm going to get a few made when I'm next at the machinist.

  • Have you any of these left?

  • There are 4 or 5 of the 45mm available for sale

  • Works a treat, thank you!

  • Anymore left?

    I'm just trying to work out that it'll definitely work with my frame

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For Sale: Slam that stem - low stack headset cover

Posted by Avatar for gbj_tester @gbj_tester