Ok, so I am thinking of getting a set for my bike to give some more hand placement options. My bike is a GT Timberline ('04). I was thinking of getting theses:

https://www.performancebike.com/shop/...e.cfm?SKU=2027

Anyone know anything about these? do they just clamp over my existing bars?

FYI, if the link does not work, they are Performance Forte OS Bar Ends

Yep, just cut off the end of your existing grips and slide those on over the bars.

They look like the old Onza's i have used for years. On the install issue, yes, they just clamp onto the end of the bars. You have a couple of options here.

1. Carefully mark and cut the necessary amount off of your grips to give room at end of bar to clamp on bar ends,

or

2. Move shifters and brake levers inwards a bit, cut open the ends of your grips, (just a circlular cut on the end of the grip so it can slide further onto bar) and slide them inboard as well, clamp on the bar ends and then move everything back out as far as it will go.

I use option two if bar width allow this.

Many Thanks!!

"1. Carefully mark and cut the necessary amount off of your grips to give room at end of bar to clamp on bar ends, "

I'd take this advice carefully. If you have small hands, this is OK. The first set of bar ends I installed in like '89 I cut the grip width down. After the first ride, guess what I did? Bought a new set of grips! Most grips are just about the perfect width. Slide all of your controls inward on the bar, making room for the clamp on the end of the bar. And if it turns out you don't need the extra width of the stock grip, you can always cut them down later. But once it's cut, it's cut!
Good luck.
PS Why is it completely uncool to ride riser bars w/ bar ends? Talk about a way to receive unending ridicule on the trail! What got this idea started? I thought form was supposed to follow function.
I'll never use riser bars - I absolutely cannot go without bar ends. Best thing since sliced bread and clipless pedals!

[QUOTE=LV2TNDM]"1. Carefully mark and cut the necessary amount off of your grips to give room at end of bar to clamp on bar ends, "QUOTE]

notice that I said I use option 2, but it is only an option if you have enough room on your bars. I don't like cutting grips either, and you lessen the amount of grip room for your hands. Some bars are so narrow, or additions like light mount or computer may make option 2 unfeasible, hence, my inclusion of option 1. Good point though about not liking grips after cut, check hand position on grips prior to cutting.

Couple of things.

When cutting grips I just slide the brakes and shifters inboard a bit then beat on the end of the grip with a metal hammer. It cuts a nice circle out of the grip that exactly matches the handlebar.

Riser bars and bar ends really don't go well together. Riser bars tend to be wider in order to make room for the rise section. Since they are wider, they sweep backward more to match your wider wrist angle. When you try to install bar ends on them, the bar ends angle outwardly and look goofy.