Bike Stem Raiser Handlebar Extender by Delta Cycle - Increases Bar Height Up to 4.6" - Riser Adapter for Mountain Bike (MTB), Hybrid, Road Bike, with Durable Aluminum Construction

This is exactly what I needed for raising the handlebar on a Specialized Rockhopper 19". With the seat raised for a 6'1" position, the original stem height was too low. This resulted in sore wrists and numb hands about 10 min into a ride.The short version:This is a reasonably priced product for the average rider. And it extends the usefulness of my bike from an aggressive downhill posture to a more exercise-oriented street ride. If you are conscious of weighing ounces on your carbon fiber bike, you'll find this irritating. If you want to re-use your existing bike and need a better riding position with some simple modifications, read up a little on how a threadless headset works and then check this out.The long version:- You will need an 5"+ extension on a screwdriver or a t-handle Allen key for the star-fangled bolt install. Note that this center screw only sets the TENSION for the headset bearing. It DOES NOT conduct the full force of holding the bearing set together with the stem. The pressure from the stem when the two back screws are tightened are what holds the headset bearing load properly. To test your leap of faith, you should be able to remove the center bolt and cap completely (leaving the two back screws on) and everything still works correctly.- If you are unfamiliar with this threadless headset setup, you MUST look it up using many educational resources available in photos and videos on the internet - or take your bike to someone who can handle this. Otherwise you may damage the headset, set up a dangerous situation for the rider, or be extremely disappointed in a what is a reasonable piece of hardware.- I preferred the full height setup in my case. I may still have to make some fine adjustments to the seat and the handlebar hardware. But my initial test rides are a vast improvement over the original height. I apply much less pressure to my hands on the bars and have a more upright (although less aerodynamic) posture. The bike is decidedly more top-heavy - but I am looking for comfort and don't need single-track trail maneuverability for what I do now. The nice thing is that it is easy to bring the bike back to its original configuration.- I had to change out the FRONT BRAKE CABLE to use the full height setting. This was an easy change out using a brake cable kit from Amazon as well. All other cables had enough slack to use as-is. It is possible to re-use the front brake cable if you are not going to full height or if you already have enough slack in the cable for the riser.- The two back screws are not the greatest quality - I recommend changing these out if you can readily get the screws from a hardware store. For what I am doing, they seem to be adequate. I chose the aluminum finish model since it matches the rest of the bike hardware. I don't expect to do any hardcore downhill riding anymore, so I have no opinion or any useful data on whether this component is "trail-rated".The above is based on initial riding on the first day of installation. Happy and safe riding!

This stem raiser successfully transformed the mountain bike of my younger years to a comfortable trekker/cruiser for this clydesdale weekend rider. After replacing my mountain tires with touring tires, I was still uncomfortable during even short rides due to the low height of my handlebars. After installing this Delta Pro Stem Raiser, my handlebars are a couple of inched higher than my seat, and I am very comfortable during 15+ mile rides.Two issues: First, it was difficult to get the proper pre-load on the headset bearings. It seemed that the long 5mm allen wrench was flexing before the bearings were acceptably pre-loaded. I removed the center bolt and applied a small amount of lithium grease to the threads of the bolt. After reinstalling the stem raiser with this bolt, I could easily get the play out of the bearings using acceptable torque on the center bolt.Second, even after applying as much torque on the pinch bolts as I dared to apply, I still had an unacceptable amount of stem slippage/rotation on the steering tube. This did not occur while riding, but it was unacceptably easy to turn the handlebars left or right while holding the tire. Even with mating surfaces clean on both the steering tube and the stem raiser, I could not eliminate the slippage. After a little research, I decided to apply a carbon fiber assembly gel to the aluminum mating surfaces between the steering tube and stem raiser before assembly. Using measurably less torque during reassembly, all slippage was eliminated. Following recommendations in previously posts, I applied a small amount of blue thread lock on the pinch bolts’ threads prior to installation to ensure the slippage does not return.The whole assembly is very secure and functional. Unlike other stem raisers, you can easily adjust the height of the stem on the Delta Pro Stem Raiser using only an allen wrench. Once the stem raiser is properly installed using the appropriate spacers on the steering tube, no spacers are needed to mount the stem to the stem raiser. The stem is easily raised or lowered on ride day according to your needs.

Picked this up to raise the handlebars on my Giant Toughroad....decent materials and construction and definitely works BUT was LONG (not their fault...mine for not doing some quick measurements). After getting my bars raised high enough to be comfortable but low enough so I didn't have to have the brake and shift lines redone to account for the new height) I still had 1/2 the riser sticking up past the bars.....ordered one slightly shorter which fit perfectly........so if you do order this, TAKE NOTE....depending on how high you want to raise the handlebars.....you will either have the excess sticking up past the bar mount OR you may have to have new brake and shift lines installed as rasing the bars takes the slack out of your lines, which when you need to turn left or right.....pulls them tight and can break/stress them. Still a good product but definitely put some time and thought into how high you want your handle bars and also take the brake and shift lines slack into consideration.

I was happy to find this stem raiser since it was the only one that could increase the height by up to 4.6". I wasn't sure what would work best for me, so I wanted a large range of adjustment. However, I don't think it really fits 1 1/8" stem diameters. I kept tightening more and more and my handlebars would still spin when torqued. When I inserted a shim made from the aluminum from a soda can, it improved, but still not good enough. I'm not skilled enough to insert multiple shims. I have a high end Diamondback DB35 stem, so I don't think it's the stem's problem. I now use another riser (WEANAS New MTB Bicycle Bike Alloy Stem Riser 1-1/8" Rise 28.6 x 117mm) and it works great. I wouldn't recommend this Delta riser for any bicycle, a road bike doesn't usually require so much torque, but how about during an emergency maneuver?

I was advised to use something like this to raise my handlebars because of a back condition, and it has worked very well, making a significant difference.

Quality product. Would recommend.

Excellent

I was looking for a riser stem for my fatbike; I tried the expensive adjustable handlebar neck and it only netted me approximately 70mm rise over the stock setup. This one, combined with the WAKE 90mm 45° handlebar neck, got me right at 140mm. w00t!Yes, there are a bunch of riser stems that are cheaper; and that's because they're CHEAP. Smaller diameter bolts and much thinner metal, particularly around the clamp, and machined just plain WRONG.When you make something like this, you do not machine a sharp right angle right at the transition area. It concentrates all lateral force (your body weight, slamming the bike around, whatever) right at a natural break point; and it WILL break there if you abuse it. You know, like is the normal way people who ride a MTB ride. :facepalm:You want forged aluminum (like this stem) for this kind of product, and you want that transition machined with a gradual radius like this one, so that lateral force is spread out over the radius area. Then you aren't inviting a break. This is machinist 101 stuff guys; no idea how the people who make the cheapies don't know this, it is positively shameful and dangerous in this application.This riser stem, in combination with the WAKE 90mm 45° handlebar neck is rock-solid even with me throwing all my 130kg into it with my fatbike and extra-long 700mm handlebars. I LOVE this riser stem.Finally... the way this is constructed, that stem is hollow with a screw-on cap, unlike the cheapies which have a cap and a long bolt through. The inner space there is approx 22mm dia by 100mm deep; perfect as a semi-safe money stash, or for emergency pills, poncho, tools, or as seen above, a 3D printed 18650 battery for one of the cheap CREE XML headlights they also sell here.

I've used this to raise my handle bars after installing a front mounted baby seat on my steerer tube. I generally like the product and design, except that the threads on the clamping bolts are much too coarse. The torque goes from 0 to 10 Nm in a quarter turn. I've had to tighten the bolts well above the recommended 10 Nm to avoid it getting loose.