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Stem Raisers

Old 04-20-14, 09:03 PM
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MAK
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Stem Raisers

Hello all,

I just got a 2005 Trek 520 in great shape. The fit is fine (seat height, KOP, reach) but I'd like to raise the bar up a few inches. I've heard that 520's were made with short steerer tubes and this is the case here. I've replaced the original stem with a 120mm 55 degree stem and it fits like my road bike. For touring, I'd like the bars to be at least even with the seat so I'm thinking of a stem raiser to gain another +/- two inches. Seems like a sound concept but I'm wondering about durability and functionality. What are your experiences and thoughts? Do you have any suggested brands, or brands to steer clear of? Thank you.
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Old 04-21-14, 01:51 AM
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Ive been using one of these for several years. Besides the price what I like about it is it slides into the original fork (tube) and doen't stick out like some others out there. Just needed some extra rings for handle bar support which I got from the LBS for free.
For this year I needed to raise the stem another couple of centimeters and it just took a couple of minutes. Again I need extra ring('s) for the handle bar.
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Old 04-21-14, 11:18 AM
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another option is the item shown at the bottom of this page under "Stem Raisers for Threadless Headsets"
Harris Cyclery Handlebar Stems
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Old 04-29-14, 05:26 PM
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Hi MAK,
I have used stem raiser on all three of my bikes, an LHT for touring, an Ogre for off pavement touring and adventuring, and on my road bike. I am tall and just wanted to get those bars UP! I have used a brand called Delta and I got them all from REI. They have performed very well. solid like they are not there. I have been on multiple tours with it on my LHT, no problems. Banged around on some pretty rocky roads with Ogre, no problems and many miles on the roadie, no problems. I have short t-rex arms for my height so the raisers and shorter stems have made my bikes comfortable. Hope this helps
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Old 04-30-14, 08:59 AM
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Like the 2nd reply, This works for Me.. BBB BHP 21 BHP-21 - Headset parts - BBB

Its a NL parts company , seems US distribution is an on and off thing , depending on the deal with a US company ,
since BBB goes to TW too for the manufacturing , (I got mine thru R&E in Seattle , Bike Mine was the distributor, then)
retail price was about the same as one of the external clamping stem raisers , out of TW.
[ rather than a higher cost as if Coming out of Eurozone, to US]
so I suppose the stuff was shipped out of Taipei to the distributors warehouse (Bike mine was in Oklahoma city)

you could fake it with a steel tube stem raiser the 0ne for 1" quills is widely sold , harris calls their stock SM249

then you need a way to adjust the threadless headset preload .

the BBB piece resolves that with a specially made quill bolt , hex is internally threaded ..


the other one you could use a regular star nut , once you tighten the quill ..

seems a compression nut from the carbon fork parts kits, would be easily removed ,

star nuts would have to be destroyed to take them out , but thats not hard to do ..

It is what I had to do to install my BHP 21.

second stem for the handle bar bag mount gained when I moved the bars up....

Last edited by fietsbob; 04-30-14 at 09:14 AM.
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Old 04-30-14, 10:53 AM
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Best thing I ever did! Raising my handlebars up just a couple of inches made all of the difference for me with comfort.
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Old 04-30-14, 01:24 PM
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We used a stem riser (threadless steerer) for years on our old Burley tandem (may it RIP). If installed properly you will have no problems. I think your 2005 model 520 has a threadless steerer.

We used one of these - $30+/-
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Old 04-30-14, 10:09 PM
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Thanks to all for the input. A few further questions...Since my steerer is about 2.5-3" long, do the raisers fit completely over the steerer? Do I need to cut the steerer so it's only as long as the base of the raiser (the thick part? If I don't cut the steerer, did you put spacers under the raiser? I've heard that it isn't suggested to put spacers under the steerer. Again, I appreciate your input.
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Old 05-01-14, 09:47 AM
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you put the one in post 7 on in place of your stem, same location.. (note the pinch bolts) , then put your stem on It.

there is an extension bolt down to the star nut , remaining where it was, in that part.

If there were spacers before you leave them there.

Last edited by fietsbob; 05-01-14 at 09:52 AM.
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Old 05-02-14, 05:38 PM
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Originally Posted by Monoborracho View Post
We used a stem riser (threadless steerer) for years on our old Burley tandem (may it RIP). If installed properly you will have no problems. I think your 2005 model 520 has a threadless steerer.

We used one of these - $30+/-
Last post by me on this thread I promise as I don't want to prolong this. Yes, my 520 has a threadless steerer. Feitsbob may have answered this but specifically...If my steerer is 3", will the Delta extender cover the entire 3" or does it only cover to the narrow part of the raiser requiring spacers below the raiser. In short, is the inside diameter of the narrow part smaller or the same as the outside diameter of the steerer? Thank you.
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Old 05-02-14, 05:49 PM
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Originally Posted by MAK View Post
Last post by me on this thread I promise as I don't want to prolong this. Yes, my 520 has a threadless steerer. Feitsbob may have answered this but specifically...If my steerer is 3", will the Delta extender cover the entire 3" or does it only cover to the narrow part of the raiser requiring spacers below the raiser. In short, is the inside diameter of the narrow part smaller or the same as the outside diameter of the steerer? Thank you.
I have one of these in my parts box, but I have never used it. The steerer tube fits only the larger portion of the extension.The narrow portion is 1 1/8" outside diameter. You will need spacers.

I was looking at a friend's bike last night. He is getting ready for his 10th cross country ride, and plans to do it very light this time. He used one of these extenders to give him a little more upright position on his road bike. It did not look near as bad on the bike as it does in the tool box.

This will give you an idea of how it fits. This is a new fork with an uncut steerer tube that will go on one of my bikes soon. I got it to fix the same problem as your trying to solve, and for the front rack mounts, rather than use an extension. Don't ask, I did not do a very good job of explaining it to my wife either, especially why it needed powder coating.


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Old 05-03-14, 07:34 AM
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Originally Posted by MAK View Post
Last post by me on this thread I promise as I don't want to prolong this. Yes, my 520 has a threadless steerer. Feitsbob may have answered this but specifically...If my steerer is 3", will the Delta extender cover the entire 3" or does it only cover to the narrow part of the raiser requiring spacers below the raiser. In short, is the inside diameter of the narrow part smaller or the same as the outside diameter of the steerer? Thank you.

The extender is installed as if it were a stem, i.e, you add enough spacers to bring it into tension when the bolt in the top cap (which is long) is screwed into the star nut in the steerer. It will not cover the 3".
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Old 05-03-14, 10:39 AM
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stems being about 4cm of the steerer, the shoulder inside the big part will only go down so far over your steerer .. IDK what that distance is .
maybe Doug can measure his ..


I wanted to add a second stem beneath the one the bars were in, for the bar bag Mount, that as It fits over the steerer tube will not be possible ..
It occupies that space for itself...

BBB internal quill type ones did allow that.
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Old 05-03-14, 10:55 AM
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Originally Posted by fietsbob View Post
stems being about 4cm of the steerer, the shoulder inside the big part will only go down so far over your steerer .. IDK what that distance is .
maybe Doug can measure his .
I measured the extender, and it covers 4.5 cm of the steerer tube.
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Old 05-03-14, 11:04 AM
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there ya go 3" is about 7.5 cm, so you have 3 cm of spacers under it, to your top headset race..
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