Wheel Change

[KevOK]

Hi Guys,

I got a hairline crack in my front rim (r1200 GSA 09). I'm told this cannot be fixed and I need to but a new wheel as rims are not sold separately. I'm currently riding it with a inner tube as it leaks slowly without.
My question is, would anyone know if I can fit smaller wheels, thinking of turning the bike into a super moto type thing for a change. Preferably a wheel that would fit easily without too much hassle.
Maybe I'm dreaming but if anyone has any info it would be greatly appreciated.
ride on

Kev

http://www.exploreplanetearth.net

 

[Ali-bear]

I believe the 17 incher from an RT or ST or R or other similar R1200 model is a simple swap.

Also I wouldn't ride around with a weakened wheel

 

[davegs]

Wheels

Silly post I know but are you sure it's a crack?, I sold my K1100LT and a week later had an irate phone call from the buyer saying he'd
found a crack,in the rear wheel. Anyway I said rubbish and he brought another wheel from Motor works, took it to the tyre fitter who wiped the crack off with a bit of rag!!!. Very expensive non-cleaning lesson learned!!.

 

[Neil W]

standard r1200gs alloys fit and look good in black, r1200rt wheels 17" front and rear will go on, you use the gs front discs, different rear wheel bolts and to make it look better swap the front mudguard for a f800 st item.
The rear wheel is 5 to 6mm off centre but not really a problem and you can use either a 170/60 or 180 rear tyre .
The silencer needs to be spaced out by 10 mm or so.
I can e mail you some pics of both options if you want , mine is going back to standard before being part exed.
Further option pick up a tatty but straight 1100/1150 gs front wheel , you only want the rim strip it get the rim powder coated black and have the devon wheel company rebuild it onto your hub

 

[DING-DONG]

Rt12, f800s, r1200s, r1200r will fit .

Here's my old bike, wearing 17" bst carbons from a r1200s .

 

[Neil W]

gsa with gs alloys

 

[Neil W]

gsa with 17" rt wheels and f800st front mudguard

 

[Neil W]

BMW list a separate front rim for the GSA, black 2.50x19 MT H2 front rim part nos 36317701492

 

[Bendy toy]

I have ordinary R1200GS alloys on my GSA, done to allow the wires to be repainted - all the usual corrosion problems.. I used the alloy wheels bolts on back wheel.

I've had them on since last summer but still not got around to doing the wires. The alloys look great in gloss black.

Weight-wise there is virtually zero difference between GS alloys and GSA wires.

The exhaust is fine with 150 tyre.. With a cut an welded joining pipe it would easily be pulled towards the wheel and with a narrow can allow full size GSA cases on both sides.

A wider tyre would need a longer angle on the link pipe to sit the exhaust can a bit further out. So back to the afterthought cutaway case..

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[Greenman14]

Assuming it is a crack have you taken it to a competent welder? Aluminium can be welded without problems although you might have to remove a spoke or two. I believe the wheels are difficult to re-spoke, though I guess Bendy has had to do this to have his powder coated so should have contacts for this work.

The weld cap could be dressed off, not a bad idea to do this and carry out a dye-penetrant NDT to be sure there are no remaining cracks, then you would have a good as new wheel for a lot less money.

 

[Bendy toy]

Ive still not got around to having my wires refinished. But here's the details

Chemical paint stripping. The only reliable way to remove BMW paint. £14 for a full alloy bike wheel
Enviro Strip (aka Thysen Krupp)
Unit 11-12a/
Hedging La Ind Est
Tamworth
01827 284333

Powder coat £25 for a bike alloy wheel. Probably a tenner for a GSA hub, but they are fiddly so ask first.
C J Ward
Dallow House
Dallow Street
Burton on Trent
Staffordshire DE14 2PQ

Wheel building (one of the very few who does cross spokes)
Kevin Blurton in Derby 01332 369085 If this number is wrong call Chris Ward as he works closely with Kev.

Also try these guys who may offer better advice about the powder coat issues
http://www.abrammotorcycles.co.uk/page_20.php?pgenme=tubeless

I'm told the rims need to be anodised because powder coat will crack under pressure from the spoke. But the Abram link shows powder coated rims so what do I know.

Ive not yet looked out an anodiser but try these guys http://www.badgeranodising.co.uk/.

 

[spondon]

Started to change out the wheels on my GSA got a set of r1200s wheels and tyres from Germany the rear is a 6" with a 190 sect tyre will finish it during the week

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[spondon]

Finished tonight had to machine 3mm off the front wheel l/h spacer so it would fit into the seal on the 1200s wheel also made 4 50mm long spacers to move the mudguard down, did not trim anything off the mudguard so it can be re used, callipers had a bit shaved of them to clear the disc mounting lugs, all in all fairly straight forward conversion, I will be changing the headers and can tomorrow then out for a spin.....

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[Nick V]

For anyone doing this conversion: have a squizz at this technical article.
I wrote this some time ago - it's the definitive guide on how to convert a GS or GSA to Supermoto, using almost all commonly-available BMW wheels (including K-series).

See pics for my two babies, converted using the procedures outlined in the doc.
The blue bike uses a standard R1200S front wheel and standard K1200S rear.
The green bike used to use standard R1200ST wheels, but currently uses a modified K1200S front wheel and standard K1200S rear.

 

[spondon]

Hi nick the R1200s front wheel L/hand bearing seal was smaller than the one on the wire wheel I took off the bike (2010 model) so that is why I had to machine a few mm of the spacer to fit into the smaller 1200s seal, should I wish to switch back I will reverse the spacer around as both ends where 37mm


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[Nick V]

Hi nick the R1200s front wheel L/hand bearing seal was smaller than the one on the wire wheel I took off the bike (2010 model) so that is why I had to machine a few mm of the spacer to fit into the smaller 1200s seal, should I wish to switch back I will reverse the spacer around as both ends where 37mm

A perfectly acceptable way of doing it. I had to do exactly the same for the spacer I used on the blue bike's front wheel.
Interestingly, the R1200R / RT / ST pattern front wheels use grease seals that complement the GS spacer perfectly. Why BMW saw fit to use different seals on different wheels, I don't know...

 

[Nick V]

By the way, what tyre makes, models and dimensions will you be using?

 

[spondon]

Dunlop 190 rear will have to look at the front later, I had to cut about 5mm from the inside edge of the main stand to clear the 190 tyre, I have an hol ins damper in the drawer from an aprila Mille that I will be fitting soon, next job is the keihin headers and acrapovic can minus the butterfly valve


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[Nick V]

Dunlop 190 rear will have to look at the front later, I had to cut about 5mm from the inside edge of the main stand to clear the 190 tyre

I took a close look at the pics - am I right in thinking it's a 190/50?
My blue bike started off with a 180/55 rear. When it started to wear to the point where the rolling circumference was slightly less than new, the bike started misfiring at anything above 60 Km/h and/or 30% throttle.

I figured out that the reduced rolling circumference (and thus, higher-than-normal rear-wheel rotational speed) was being interpreted by the engine ECU as wheelspin. At that point, the ASC would intervene.
I solved the issue by exchanging the 180/55 for a 190/55. The extra rolling circumference sorted it. A 180/60 would probably have done the same job.

I have an hol ins damper in the drawer from an aprila Mille that I will be fitting soon

If there is no way to fit it across the upper triple clamp, you may want to consider mounting it the same way as on an R1200R or R1200S (drilling and tapping one hole each in the lower triple clamp and front suspension A-arm.

In my parts bin, I currently have two F800S / ST steering dampers, and one K1200S steering damper. My blue bike uses the A-arm and bottom clamp from an R1200S, so I can slot one straight on if need be. But if I'm honest with myself, the bike is forgiving enough that it doesn't need one.

next job is the keihin headers and acrapovic can minus the butterfly valve

Read this. Some useful tips that might help!

 

[spondon]

Good information there nick, the link pipe from the keihin headers to the acra can will be longer than the 67mm that you suggest in order for the can to clear the tyre I cut a piece 67mm long but it needs to be 30 mm longer


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