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BT45 Tyre Size Query
Posted: Mon Jan 12, 2015 6:18 pm
Author: Tonto
Chaps - Ive been pleased with the BT45's I fitted to my Z900 A4, but I'll soon be due for a new rear tyre and was wondering if I could get away with fitting a slightly wider tyre ?
I have standard Rims and currently run a 120/90 x 18, but was not sure if I could get away with fitting a 130/80 x18 ?
I know its not a big difference, but I've got the wider BT45 fitted on another old Kwak and the "turn in" feels a lot nicer.
Any guidance appreciated. Cheers Tim
Posted: Mon Jan 12, 2015 6:35 pm
Author: jimmock
A 130 means the chain guard MUST come off.
Posted: Mon Jan 12, 2015 9:16 pm
Author: chrisu
check the tyre to chainguard clearance.
can you cope with another 5mm ?
Posted: Mon Jan 12, 2015 9:19 pm
Author: jimmock
chrisu wrote:check the tyre to chainguard clearance.
can you cope with another 5mm ?
ADMIN, COME ON.....
That was a sexually motivated question.
Posted: Tue Jan 13, 2015 11:43 am
Author: Tonto
Thanks guys: I thought it was going to be tight, but had not given the chainguard serious consideration Doh !!
I'll take some proper measurements before buying my new tyre.
Posted: Tue Jan 13, 2015 4:30 pm
Author: chrisu
jimmock wrote:chrisu wrote:check the tyre to chainguard clearance.
can you cope with another 5mm ?
ADMIN, COME ON.....
That was a sexually motivated question.
Jim - are really expecting me to moderate myself ? .........
Posted: Wed Jan 14, 2015 8:12 am
Author: scott
If you did go for the slightly wider tyre, what effects would it have on handling, especially higher up the mph scale?
Posted: Wed Jan 14, 2015 8:15 am
Author: jimmock
chrisu wrote:jimmock wrote:chrisu wrote:check the tyre to chainguard clearance.
can you cope with another 5mm ?
ADMIN, COME ON.....
That was a sexually motivated question.
Jim - are really expecting me to moderate myself ? .........
That sounds sexual ??
Posted: Wed Jan 14, 2015 8:32 am
Author: mick znone
could always buy a spare chainguard and cut it down.
Posted: Wed Jan 14, 2015 12:01 pm
Author: Chris Riv
scott wrote:If you did go for the slightly wider tyre, what effects would it have on handling, especially higher up the mph scale?
I had a Z1 with a 150 rear tyre. It was ok when the tyre was new but as the profile flattened off it started to weave badly above about 80mph. It was otherwise a standard bike. I got round it by fitting Z650 yokes (more trail) & this moved the weave to about 110mph.
Posted: Wed Jan 14, 2015 12:01 pm
Author: Tonto
Just checked and Ive got a 12mm gap between inner edge of chainguard (which is a dodgy pattern replica
) and existing 120 tyre, I'll re-check swingarm clearance, but it does look promising for fitting a 130 replacement.
Posted: Wed Jan 14, 2015 1:55 pm
Author: njwmct
Stick with the standard tyre size as that suits the wheel rim width. A wider tyre is more than likely going to spoil the feel/handling of your bike.