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Old 12-03-2012, 10:38 PM   #1
mrfortynine OP
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Effective way to make a handlebar slightly thinner?

Hello,

I'm trying to make a chrome handlebar slightly thinner, so that I can fit it to a 92 BMW airhead, which originally comes with 22mm handle bar. The one I'm trying to modify seems only a tiny bit larger on diameter. Does anyone have any suggestion regarding the most efficient method to do this?

Thanks a lot.

jia
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Old 12-03-2012, 11:18 PM   #2
griffo1962
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Quote:
Originally Posted by mrfortynine View Post
Hello,

I'm trying to make a chrome handlebar slightly thinner, so that I can fit it to a 92 BMW airhead, which originally comes with 22mm handle bar. The one I'm trying to modify seems only a tiny bit larger on diameter. Does anyone have any suggestion regarding the most efficient method to do this?

Thanks a lot.

jia

Unless it's a "Fatbar" then it is 22mm (or the imperial equivalent 7/8") there should be no need to make it smaller.........
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Old 12-03-2012, 11:24 PM   #3
mrfortynine OP
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Originally Posted by griffo1962 View Post
Unless it's a "Fatbar" then it is 22mm (or the imperial equivalent 7/8") there should be no need to make it smaller.........
7/8" is actually 22.225mm. I tried for about 15 minutes before I gave up. It seems other bmw handle bar parts really don't tolerate that much difference.
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Old 12-04-2012, 01:42 AM   #4
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1" wide belt sander. Use where belt isn't backed up by a platen.

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Old 12-04-2012, 01:57 AM   #5
PeterW
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I'd be tempted to use one of the fabric backed sanding strips used on power sanders and work it down by hand. Tape off the areas each side.

Belt sander will do it no doubt, but it's also more likely to overdo it as well.

Whatever, you will ruin the chrome ?

Pete
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Old 12-04-2012, 06:07 AM   #6
Daryl_Stamp
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.225 is about .008", taking that much off w/ abrasive is no doubt do-able but doing so uniformly by hand over the width of the 2 clamps seems like a really tall order. Possible to remove the clamping halves & have some one with a mill or lathe to bore out the .008" required? Seems like a big pita either way. May also try setting up a 'turning' arrangement by making clamping block (wood gobbled up with grease) that fits loosely enough to rotate bars around axis of motorcycle clamping bolt then carefully grinding down with abrasive tool of some type. Would aid in more uniform material removal, but still pretty hokey.
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Old 12-04-2012, 06:18 AM   #7
VStromTom
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Maybe working on the clamps would be better than paring down the handlebar? Not sure what the mounting system is on the bike you cite. Seems an enlargement of the clamp could be done invisibly?
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Old 12-04-2012, 06:45 AM   #8
LuciferMutt
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Jebus just buy handlebars the correct size. Trust me on this -- the amount of time and effort required to get the ones you have to fit will far outweigh just spending some $ on the right ones! Quit while you're ahead!

I'd also be somewhat worried about the decrease in bar strength from thinning the walls.
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Old 12-04-2012, 07:28 AM   #9
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We can be our own worst enemy...

No point in buggering up a part to make it fit when the right size part isn't that expensive.
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Old 12-04-2012, 08:08 AM   #10
mrfortynine OP
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Thank everyone for the advices. After trying a bit more, I decided to give up. That said, its actually quite difficult to 22mm M bar (some call it clubman) here in US.
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Old 12-04-2012, 08:55 AM   #11
GearHeadGrrrl
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Same decision I made 2 decades ago...

When I tried to fit my favorite bar off my Yamaha RD400 to my BMW airhead. Put the 7/8" bar back on the RD and bought a proper 22 mm. Fehling bar for the airhead.
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Old 12-04-2012, 09:10 AM   #12
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Quote:
Originally Posted by GearHeadGrrrl View Post
When I tried to fit my favorite bar off my Yamaha RD400 to my BMW airhead. Put the 7/8" bar back on the RD and bought a proper 22 mm. Fehling bar for the airhead.
Interestingly, the bar i got is from Fehling. On their website, it says "22mm (7/8")". So I took my chance. Well.
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Old 12-04-2012, 11:48 AM   #13
GearHeadGrrrl
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Wonder if they shipped the wrong bar?

I think they sell some of the same bar shapes in both sizes...
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Old 12-04-2012, 04:40 PM   #14
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I have filed & sanded down the bars twice now to 22mm. Doesn't need to be precise. Generally the bars I use (Protaper & Sunline) are knurled on the clutch side (& fatter), & smooth on the right. Be careful not to use any force sliding on the clutch perch, as this fractures easily. I've found that the right (throttle) side needs no work.

I've got fat bars on Rox Risers on Gus. They taper down to normal sizing anyway. I crashed fairly heavily last week, & they stood up to that well.
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Box'a'bits screwed with this post 12-04-2012 at 06:16 PM
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Old 12-04-2012, 05:43 PM   #15
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Only place where I have found decent BMW 22 mm bars is from Flanders handlebars in California. Great stuff. I have always been told that it is much easier to "ream" out the controls to fit a 7/8 bar than to make the bar smaller.
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