bar risers (regular to fat)

[5valve]

Id like to have those pieces made and am wondering, does anyone have a closeup pic of them just for a brief idea how to solve the bolting problem, since probably 8 bolts are needed...4 for fixing risers to clamps and 4 for fixing fatbars to risers

why not just buy them?

well, where I live, specialists are still much cheaper (with all necessary technology) than aftermarket stuff, and Id get nice cut from one pice, rather then moulded stuff

also you can email them to dj@enduro-si.com

greatly apprechiated ?

those seem simple and 4 bolt only

[jasilva]

Also seems like your trusting bolts that were not designed to bear a shear load to keep you in control of your bike. Bet the med bills if your bars come off in high G situation(like jumping or whoops)will add up to a lot more than the cost of a decent replacement triple clamp and bar mounts. ?

Joe

[roostboy wr250f]

Just spend 40 bucks and buy the universal clamps for big bars like in the picture

[JTWR450]

I run that EXACT same mount for my FatBars with NO issues at all. They snug up nice and have yet to come lose. A little LocTite will help as well. Get the mounts and you will be happy.

[5valve]

I'm 6 feet tall (if I converted correctly) and am currently using 1,4in home made risers for standard bar and they still seem to low for standing--a bit bent knees, back pain after prolongued ride, so im thinking of going 1.6in

to skip to another product..anyone using those?

http://www.mts.net/~andyj/barrisers/1_18_risers.jpg

they seem fine because they move the bar forward, killing the angle of the fork clamps, but I dont really know what to expect from riding that way except for more space

[5valve]

took me a few hrs to realize the plan

copied the ones from the link in first post, but added more material for approx 1,5in rising of the bar

[Flash319]

That just looks scary!!! I would spend the money on new triple clamps before I would do that. If you come down on the front tire hard, say you screw up a landing, you are relying on 4 bolts with 2 inches of leverage on them. Not sure of the math but I would say the force on the bolts would be very high. I would be thinking about them the whole time I was riding.

[bg10459]

I'm not to sure shear strength is the issue here, more likely you would be concerned with tensile strength. Either way, I highly doubt you could break a 1/4" bolt (I'm guessing the metric fasteners are close to 1/4", maybe larger), much less 4 of them. The tensile strength of a 1/4" grade 5 bolt is about 4000 lbs and the shear strength is about 3500 lbs (both breaking strengths). If you’re involved in a crash that places that much force on the hardware, I’d guess you’ll have much worse things to worry about (like compound fractures in both arms) . I don't have the patience to post the mathmatical calculations to back up my theory, but I'm sure someone does and will either concur or prove me wrong.

All that said, I’d buy a new top clamp and risers, or at least the adapters. But he is in Slovenia. I have no idea what parts cost around there, or what his financial situation.

[mjslim]

Hey 5valve,

It's hard to tell from looking at the photos if your risers are flat on the bottom or if they have a 7/8 inch diameter "half moon" to fit the void where the stock handlebars went on the triple clamp. If you have the half moon, or at least a 2 or 3 mm step that fits into that void, then your design will be a lot stronger because the half moon will carry the shear load if the bars try to bend in a crash. You won't have to worry about carrying all the shear load on the bolts.

[5valve]

hello

in Slovenia adapters cost 70$ and provide max 0,6" rising of the bar

friend bought them and I used them for copying mine but with higher rising

bolts used are 1/3" for lower part riser, bolted to the clamp and the same for upper part bolted to the lower riser

I could have risers CNC cut, but was given this option right after I invested quite some work in making them, so just had to finish

im not into tensile and shear strengths, but I used the strongest possible bolts (rostfrei) and bought the correct size to use the whole length of the threads in the clamp and in the riser

at that bolt thickness, i dont belive there is a serious breaking issue

I mostly ride tight woods, hillclims, fallen trees, mud, so big jumps dont concerne me and already I had 2 nasty rides with many falls over wet lodges hitting rocks with bar, but nothing really happened, very rigid structure for now

about the half moon sitting in the clamp "negative half moon"..I actually had to skip it, to provide even surfaces on both risers so at first I was thinking on bolting up the half moons, but after closer inspection of the original riser, which had this moon, its only used to properly fix when firstly bolting the lower part on the clamp...it doesnt have any contact with the clamp "negative half moon" and can move back and forth about 0,04" for correct bar allignment in both adapters

might reconsider for making at least a bit of seating if strength would increase

[bg10459]

I think you'll be OK. 1/3" or between 7 and 8 mm bolts have relatively huge shear and tensile strengths. Your arms will be broken way before those bolts.

[5valve]

yes, they are 8 mm just my conversion math is a bit unexact

[Joe Reitman]

Are the fabricated risers heat treated? Which aluminum alloy are they?

Seems like that would make a big difference in strenght.

[hypersport]

5valve: I too am 6' tall, and require a high bar settup. Like many of the others, I simply purchased the pro taper conversioin kit (like in your first picture) along with a high bend bar. It is very simple, and seems to be very strong too, I had the same settup on a WR 250 for 2 years and absolutely no problems ever.

The conversion adapters give me about .5 like you said. That along with the high bend bars make a HUGE difference as I do much of my riding standing up.

Another thing I did was to grab a kidney belt. That also keeps my lower back much less fatigued after a few hours of riding.

I really love the comfort of where my bars are at, not to mention the added leverage

[5valve]

about original risers, wich I copied

when they felt on the concrete floor, they got scars like ordinary alu, which I used

I got renthal fat bar cheap, and high bars are a waitable product, so I decided to go for an ultra high riser

I think it will work, since my previous, regular to regular risers, were much worse built and they worked flawlessly

the only problem I had at the beginning was sliding bar to forth, because of not really well polished bar seating surfaces, wich I eliminated with more bolt torque...and it worked for a year, no questions asked

now, those seating surfaces are shaped close to perfect and that "close to" is filled with 2 component hardeninig steel

[perryg114]

Here is another option to consider.

http://perryg114.home.mindspring.com/risers.html

Perry

[5valve]

good one since it eliminates the clamp angle