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Dimension Steerer Extender 1-1/8 Black Threadless Adds 2 to 3-1/4 "

4.2 out of 5 stars 29 customer reviews

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  • Extender clamps to steerer; stem clamps to extender
  • Adds 2 to 3-1/4" height to threadless steerer
  • Includes top cap and long bolt
  • 40mm of threadless steerer is required for proper installation
  • Do not stack steerer extenders; no more than one steerer extender recommended per bike
Currently unavailable. We don't know when or if this item will be back in stock.

Technical Details


Product Description

Dimension Steerer Extender adds 2 to 3-1/4" height to steerer.
  • Extender clamps to steerer; stem clamps to extender
  • Adds 2 to 3-1/4" height to threadless steerer
  • Includes top cap and long bolt
  • 40mm of threadless steerer is required for proper installation
  • Do not stack steerer extenders; no more than one steerer extender recommended per bike
  • WARNING: Dimension Steerer Extender is not recommended for use on forks with carbon fiber steerers
Item Specifications
ColorBlack
Steerer Size1-1/8"
Stem Size1-1/8"

Product Details

  • Product Dimensions: 8.5 x 4.8 x 1.8 inches ; 8.3 ounces
  • Shipping Weight: 7.7 ounces
  • ASIN: B001C6DTZY
  • Average Customer Review: 4.2 out of 5 stars  See all reviews (29 customer reviews)
  • Amazon Best Sellers Rank: #508,782 in Sports & Outdoors (See Top 100 in Sports & Outdoors)

Customer Reviews

Top Customer Reviews

This stem extender does exactly what it is supposed to do. I had to really torque the stem bolt to properly seat the headset bearings, but that wasn't a problem as it's very easy to tell when it's not tight enough (the fork wiggles in the head tube, especially while braking).
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By willy w. on September 22, 2010
Verified Purchase
Needed to add some height to fork stem that had been previously cut. Worked well & didn't look
like a "band aid". Note of caution......you may need to replace your cables if they don't have enough
"slack" to accommodate added height.
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By Shawn on February 24, 2013
Verified Purchase
This item was a perfect fit for both me and the bicycle. It raise the handle bars up so that my back no longer aches after 20 or 30 miles. The bolt was the perfect length and it slide on like a glove. I did not have any issues with the cables on my bicycle not reaching. When riding it feels fine, its as if the bike came from the manufacturer with this piece attached. Also it doesn't weight a ton, its much lighter than I expected.
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I don't care how "dorky" it may look to all the purist out there - it works. The owner of my LBS (local bike shop) added this to the bike of my dreams - a 2011 Raleigh Sojourn touring road bike. I can finally get back on a road bike without my lower back killing me within 6 - 7 miles. 20, 25 even 30 mile rides are not out of the question with no pain.

I realize 30 miles doesn't sound like a lot to those who have completed "Century Rides". But consider having degenerative bone disease in the lower back & arthritic knees - then try it. Enough said?
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My Gf wanted her trek 7500 to give her a more upright riding position. I purchased this extender and a new stem to fit the bill. This gives her a similar set up as my 7300 a more upright ride.
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This product will definitely solve your handlebar height problem if you can get it to work. In my case, no amount of tightening would secure the extender to the threadless steerer. I used a very long cheater bar with my allen wrench to get the pinch bolts as tight as I possibly could. The extender would still slip around the steerer tube. Definitely not safe. I ended up buying an adjustable stem that allowed me to set the stem at a very steep angle. Worked perfectly.
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Using a couple of hex wrenches, I was able to install and adjust this in under 20 minutes. I was fortunate in that I didn't need to replace the cable. Doesn't look too bad, but I'm getting to the age where comfort supersedes looks. If you want to sit a little higher, I highly recommend this product.
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I use this to raise my bars on my GT Zum. The only complaint I have, it only comes with one shaft bolt. My bike needs a longer bolt so I'll have to find one at a hardware store that will work. It also has a plastic cap that will strip easily.
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