Author Topic: Rear tyre width  (Read 1186 times)

Offline Andreas Larsen

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Rear tyre width
« on: 09.09. 2014 19:31 »
Hey guys.

My sister is always teasing the skinny rear tyre on the beezer *razz* but it just got me thinking if it would be possible and any good to fit a slightly fatter rear tyre?

As I'm having a few problems with the A10 (rusty tank, no charge, bad wiring, leaky head gasket, engine paint starting to get rusty, bad brakes etc.) I'll strip it down soon and start working on it during the winter and I'm looking at changing to stainless steel rims and spokes because the rims are starting to look bad (not gonna ask which tyres to run as I won't want to start trouble *fight*).

Thoughts?

Regards
Andreas
'58 A10 swingarm

Offline duTch

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Re: Rear tyre width
« Reply #1 on: 09.09. 2014 22:02 »

 Girls can be like that- especially sisters, I run a 4.00", could possibly go to 4.50" before interfering with the chain(on a Plunger, can't imagine S/A any diffo.)- if that's not good enough for her, tell her to go get her own fat one... *eek*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline Andreas Larsen

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Re: Rear tyre width
« Reply #2 on: 09.09. 2014 22:49 »
I know!  *problem* It was just a thought while I'm looking at changing rims anyway!
'58 A10 swingarm

Offline Andreas Larsen

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Re: Rear tyre width
« Reply #3 on: 12.09. 2014 21:06 »
I apologize in advance if these are stupid questions.

Just for the sake of argument (as my funds are limited) if I were to fit a slightly fatter rear tyre, say a 4.00x19 in stead of the 3.50x19, would I then need a wider rim, a WM 3 in stead of the WM 2?
And would I then be able to spoke the wheel with the old drum or would that require a new one?
And for the last one, can any rim be fitted with a tubeless tyre or does that require something special of the rim etc.?

I hope you can help shed a little light on the matter, as I'm still quite new to all this  *conf*

Cheers
Andreas
'58 A10 swingarm

Online Angus

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Re: Rear tyre width
« Reply #4 on: 12.09. 2014 21:23 »
Hi Andreas

I nearly answered you original question as I run 4.25 rear tire on the 1960 A7 and always have since 1976. This is on standard WM2 rims. They just fit. The new tyre fitted this year high lighted a problem with the offset on the rim(post here elsewhere), but with that cured it its fine.
So standard rim and standard drum. Thats question 1 & 2 can not answer question 3, but I don't think you can fit tubeless.
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Offline Triton Thrasher

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Re: Rear tyre width
« Reply #5 on: 12.09. 2014 21:34 »
Fat back tyres on these bikes are a handling disaster.

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Re: Rear tyre width
« Reply #6 on: 12.09. 2014 23:30 »
Fat back tyres on these bikes are a handling disaster.
Unless you increase the width of the front as well.
On my '57 ex racer front 100/90x19 rear 110/90x18, the '51 plunger has 100/90x19 front & rear, all Avon AM26.

Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Offline duTch

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Re: Rear tyre width
« Reply #7 on: 13.09. 2014 09:44 »

 Weell- I have the rear 18x4.00 on a WM3, and front 3.50x21 on a WM1, and apart from what feels like occasional fork flex, it rides like a dream (on Metzler Enduros)..I guess I'm not flogging it round a track though...and governed a bit by crap clearance on the left....but still a joy to ride. *ex*

 point to note;- I put a bit of time into making sure the rims are centered in the frame
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline Triton Thrasher

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Re: Rear tyre width
« Reply #8 on: 13.09. 2014 09:50 »
Unless you increase the width of the front as well.
On my '57 ex racer front 100/90x19 rear 110/90x18, the '51 plunger has 100/90x19 front & rear, all Avon AM26.

Cheers


I've used such sizes too and they seem fine, but they're still the sort of restricted width that might attract teasing from sisters, which is the "problem" to which we are seeking a solution.

Offline Triton Thrasher

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Re: Rear tyre width
« Reply #9 on: 13.09. 2014 11:31 »
The answer is to say something about the width of your sister's tyre.

Online bsa-bill

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Re: Rear tyre width
« Reply #10 on: 13.09. 2014 11:40 »
Quote
The answer is to say something about the width of your sister's tyre.

Oh Oh - I sense danger
All the best - Bill
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Offline Andreas Larsen

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Re: Rear tyre width
« Reply #11 on: 13.09. 2014 16:37 »
Hehehe, danger indeed!

She's got an old 80's yamaha so she's not really one to talk!  *smile*

I think I've got an idea on which direction to go now.
Thanks for the input everyone!

Andreas
'58 A10 swingarm

Offline Rgs-Bill

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Re: Rear tyre width
« Reply #12 on: 13.09. 2014 19:58 »
Hehehe, danger indeed!

She's got an old 80's yamaha so she's not really one to talk!  *smile*

I think I've got an idea on which direction to go now.
Thanks for the input everyone!

Andreas
[/quote)  the most I can get on the rear tire of an A-10, 62 model is , (the old tire sizes)  4:25 and then the hub offset has to be just perfect to get the clearances on both sides of the tire. 
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