TKC 80 problem

[Belper phil]

Rear tyre is catching on the inside of the swingarm.

Its the correct size 130/80 17R and its blown up to 60 psi currently but never the less still catches swingarm. Fitted correctly on rim and tyre has been put on with directional travel in the right way. Whatever pressure i try it rubs the swingarm.

Bike is an 89 R80GS - do i need a spacer on the inside of the wheel - where the bolts go through - anyone else ever had a problem with these.

Ta

 

[Damien]

Is 60 psi a typo?

 

[ghiribizzo]

@omen I suspect he has it at 60psi not to ride, but in the hope that the higher pressure would alter the shape of the tyre section in an effort to see if it would clear the swingarm...

 

[Damien]

Sorry I can't help you as mine is an 86.

However I thought TKC80's were popular fitment to your model.

Someone who knows what they are talking about will be along shortly.

 

[toadjam]

tyre catching

not tried a tkc on my gs ( used em on a tt600 and a dr600 ) , but i,m sure i read a thread about this ( might have been on adv rider ) .
i think the answer was to trim the knobbles of the swing arm side of the tyre .
hope this helps .

 

[cheap'n'cheerful]

I had the same problem on my 80 so trimmed the corner of the nobbles so it cleared the swing arm

Cheers C'n'C

 

[Bury_Dave]

60 psi ? It's only 36/37 for my F800. They must look like monkey bike tyres !

 

[Belper phil]

'I suspect he has it at 60psi not to ride, but in the hope that the higher pressure would alter the shape of the tyre section'

Spot on, but unfortunately has'nt worked. Trimming as suggested seems the quickest easiest route but may try a get some type of spacer made.

Failing that i'll look on Adv rider Jodie for the thread

 

[Timolgra]

I had the same problem on my 80 so trimmed the corner of the nobbles so it cleared the swing arm

Cheers C'n'C

Angle grinder to take the edge off

 

[VAL. H.]

Rear tyre is catching on the inside of the swingarm.

Its the correct size 130/80 17R and its blown up to 60 psi currently but never the less still catches swingarm. Fitted correctly on rim and tyre has been put on with directional travel in the right way. Whatever pressure i try it rubs the swingarm.

Bike is an 89 R80GS - do i need a spacer on the inside of the wheel - where the bolts go through - anyone else ever had a problem with these.

Ta

Phil, Did you fit them your self? If you did, is it seated proppery? sounds like the seat is too low in the well.

Try letting the air out (correct pressure should be 35psi for solo use, 37-40 loaded. 27 for the front. Just incase you didn't know ). With it flat and the wheel off the bike. Hold the tyre in two hands and bounce the edge of the tread on the ground at an angle of aproximately 45o, turning the wheel every couple of hits. Then turning it over and doing the same the other side. This encourages the bead in to the correct place. There's often a line just above the bead, which needs to be an even distance from the rim. This will hopfully reseat the tyre and stop it rubbing.

You will need to unseat the bead and lube the rim for this to be effective, as the tyre bead/seal will have dried by now. Some times taking the bike for a short ride with a lower pressure, say 25psi can do much the same thing.


Val.

 

[carinatauk]

I used a spacer

You should be able to get these through the usual outlets, can't remember the thickness but they are cheap

 

[Belper phil]

motorcycle tyre company

Fitted them in Derby, not got the equipment myself.

Once helped Jaber do some TKC's on his Enfield - by fucking hand - he's a hard bastard no soap or levers - never again!

Fitment looks true although i would be prepared to ride the bastard with low pressure to see if that seated it better. ta for the pressures also - similar to what i run on the others by the way.

Looks like Carinatauk has had a similar problem so i've gone for the option of a local fabricating company to make a spacer - if that fails i'll get the grinder

 

[Paradiso]

I used a potato peeler to shave the corners off the nobbles. Worked a treat.

 

[VAL. H.]

I used a potato peeler to shave the corners off the nobbles. Worked a treat.

I had a GSXR1100 which had been converted to 17" wheels with a 180 rear. That one rubbed. On the chain.

After a few miles the edge of the tyre ttok on a look not to dissimilar to the blade of a bread knife.


Val.

 

[Belper phil]

spacer fitted!!!

But fuck there's a gap between wheel and final drive that you can see in too.

Closer up shot and then from above

Dont like the look of this, although brake works fine and wheel turns smoothly enough. Any words of wisdom from anyone who may have fitted a spacer - it's 5mm thickness by the way.

Any help gladly accepted

 

[bmbb77]

lop the knobs off. ive fitted a 140 mitas on my 80 g/s, just had to cut some of the knob off. no ill effects...

 

[DrFarkoff]

Get the spacer out

The rear seal has enough to deal with brake dust wiithout more schite gettin in there!

If you are over far enough on the tyre to notice the couple of millimetres missing you won;t miss them you are that good!

 

[mavis cruet]

ive got tkcs on my r100gs and they dont appear to rub, but there is definately a groove worn in the swing arm, so i guess they do. no probs in 80,000 miles though...

 

[VAL. H.]

ive got tkcs on my r100gs and they dont appear to rub, but there is definately a groove worn in the swing arm, so i guess they do. no probs in 80,000 miles though...

Yep! Same with Jills 100. Put new tyres on last week. Whilst there is evidence of some rubbing, I believe this to be mud and grit carried by the tyre, rather than the tyre it's self.



Val.

 

[Belper phil]

Sorted now

Potato peeler to just take the very edge off every other block and machined the spacer down to 2mm.

No extra gap now between final drive housing and wheel, and the tyre does not catch anymore - result . Bike also handles well at speed, 80mph and when cornering.