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PostPosted: Sat Sep 30, 2017 6:31 am 
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I ride a Tarmac with a stock Specialized stem. It seems the top cap is larger than standard, is that correct? Is it married to the stem, meaning if I change stem brands the top cap will be smaller/standard? Thanks for any input, I am ignorant on this! Btw, is the bolt size the same regardless?

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PostPosted: Wed Oct 04, 2017 7:41 pm 
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Anyone know about this?

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Posted: Wed Oct 04, 2017 7:41 pm 


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PostPosted: Wed Oct 04, 2017 9:28 pm 
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A picture is worth a 1000 words. But without one the Tarmacs all have 1 1/8" upper headset bearings which is as close to a std size as you can get. So the preload cap should be standard, and the bolt should be standard as well. Some stems have top caps that are mated to them, but without a picture it is hard to know what stem you might have.


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PostPosted: Thu Oct 05, 2017 1:27 pm 
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Joined: Tue Apr 18, 2006 3:03 am
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Location: Islip, NY
Top cap that came with my frameset is standard. Replaced with

Image

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PostPosted: Thu Oct 05, 2017 3:14 pm 
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I believe the headset is standard, just seems I saw something about Specialized stems having oversized caps. Also, I recently bought a fun top cap which is too small, so thought I'd ask here for more specifics.

Here are a couple of pics... Thanks! ImageImage

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PostPosted: Thu Oct 05, 2017 4:25 pm 
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mvcap wrote:
I believe the headset is standard, just seems I saw something about Specialized stems having oversized caps. Also, I recently bought a fun top cap which is too small, so thought I'd ask here for more specifics.

Here are a couple of pics... Thanks! ImageImage

Sent from my Nexus 6P using Tapatalk


Ok....what you have here is the exception. That cap is specifically designed to work with that stem and it's ability to adjust the stem angle through the use of shims. You will have to replace the top cap if you replace the stem. And other top caps will try to angle the bolt in a weird way if you use it on top of the stem you currently own.


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PostPosted: Thu Oct 05, 2017 5:24 pm 
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Location: Islip, NY
Ahh. That one is not concentric so the stem can be put in two different positions without flipping it.

I don't think there are aftermarket caps for that.

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PostPosted: Thu Oct 05, 2017 7:18 pm 
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Much appreciated! Good to know, have a great day and thanks again!

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PostPosted: Thu Oct 05, 2017 11:48 pm 
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I had a similar specialized stem on an old bike. Because it has a shim attached that allowed it to be used in + or - angles as well as 8˚ or 17˚ (along those lines) the top cap is special because it needs to match up with said shim by angling itself. Hope that makes sense.


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PostPosted: Sat Oct 07, 2017 2:13 pm 
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Having zero experience with shims, is that why it has the + and - marked on it? Thanks!

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PostPosted: Sun Oct 08, 2017 2:56 am 
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The shim is a little metal insert inside your stem. It allows you to change your stem from positive to negative angle (leave the shim where it is and flip the stem) or to change the angle of your stem by spinning the shim 180˚. The +- topcap just allows this shim to work. The top cap angles itself which is necessary on this stem. If you change stems you can just get a normal top cap.
Hope that makes sense.


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PostPosted: Sun Oct 08, 2017 3:41 am 
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Joined: Fri Apr 22, 2016 9:50 pm
Posts: 51
JScycle wrote:
The shim is a little metal insert inside your stem. It allows you to change your stem from positive to negative angle (leave the shim where it is and flip the stem) or to change the angle of your stem by spinning the shim 180˚. The +- topcap just allows this shim to work. The top cap angles itself which is necessary on this stem. If you change stems you can just get a normal top cap.
Hope that makes sense.
Yes perfect sense, and I do appreciate the explanation!

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Posted: Sun Oct 08, 2017 3:41 am 


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