Z1OwnersClub GB

I’m revising the rear end on my A2 and would appreciate any advice I can get from the huge collective knowledge here ;)

Basically I want to run a 180 tyre on a spoked rim using the standard hub. I’m using a deepbrace JMC swingarm.

I’m guessing I’ll be using a 5.00 rim and a 5/8â€￾ offset front sprocket with a 530 chain.

The bit I’m unsure of is the offset when getting the wheel rebuilt.

Anyone done this before??

Be great to hear any experiences.

Cheers

You'll need to check wheel alignment yourself and put it all together and see where the centre of the rim is in relation to the hub. This way it'll be quite easy to sort the axel/spacer bits out & get the wheel to suit.

As a guide, my Z1000 runs a JMC slotted drag s/arm, 5/8" & 630 with a Gixxer mag + 180 tyre..... so you could check a Gixxer/Bandit wheel out for off-set?

I think the best bet (as JMC arms vary in construction) is to rig it all up & do some careful measuring

Some good info on this in a very old thread when I asked the question!

http://www.z1ownersclub.co.uk/forum/vie ... ght=wheels

I think you will find that a 5.5" rim is the recommended width for a 180 tyre. I am in the process of fitting a 180/55 tyre on a 17"/5.5" wheel at the rear but using cast wheels. The bike will sit lower at the rear unless you fit longer shocks as the diameter of the tyre is smaller than standard.

If you do fit longer shocks, beware chain tension as the chain may be too slack when the shocks are extended. Sanctuary sell a chain tensioner that bolts to the LH centre stand bracket to keep tension more stable as the shock extends. Link below.

http://www.noblest.co.jp/products/detail105.html

Not sure for an A2, but on a Z1/900 you also need to modify the LH footrest mountings studs. These studs screw into the frame and have a locknut on the inside. The 5/8 offset sprocket means that the chain will foul the locknut and you need to shorten the stud, ditch the locknut and use loctite instead.

..and check that your 180 tyre is happy with an inner tube. Most 180 tyres are designed for tubeless applications.

You need a 5.5 in rim for 170/180 tyre and have the wheel rebuilt with the same offsets as std so that the rim/tyre runs central as std (do not offset the rim to gain chain clearance)
Use a front sprocket with 5/8th offset (this is the widest with std frame)
To account for the smaller rolling radius of the 17" rim set the gearing at 1.94 -1 (if going for std gearing) as this gives the nearest equivalent distance travelled per tooth as the original 2.2 -1.
As above the footrest bolts will need shortening and the nuts looseing to avoid fouling.
630 chain will "just" clear the frame and 180 tyre by a gnats and 530 will give around 5mm clearance.
If you drop a straight edge from the offset front sprockets inner face on to the swingarm spindle you will find that this distance is 101mm from the spindle center or 218.5mm from the right hand inner frame stub.(this is based on the average 235mm inner frame width and can vary by half a mill or so either way) so to align the rear sprocket the carriers mounting face must be 101mm (+/- half a mill depending) from the hubs center and either some machining or a spacer will be required depending on the hub/carrier being used.

Just a little more info.
As per info from another member - 180/55-17 tyres are designed to fit a 5.50 inch rim.
As far as an inner tube goes Continental do one to suit which they call a 'G17'

Mr Holeshot,

I bought a spare 5/8th offset 530 sprocket when we did a group buy. I doubt I'll have a need for it for many a year and happy to pass it on for what I paid.

£33 plus £3 postage if my memory functions...

19 tooth, 530, 5/8 off-set, Z13 splines to fit models up to and including KZ1000 D3 and G1.

Here's a link to the thread.

http://www.z1ownersclub.co.uk/forum/vie ... sc&start=0

Gary

LondonZ1 wrote:Sanctuary sell a chain tensioner that bolts to the LH centre stand bracket to keep tension more stable as the shock extends. Link below.

http://www.noblest.co.jp/products/detail105.html

Does anyone know where I can get one of these or something similar in the UK or EU ??

regards
Howie

HowieD wrote:

LondonZ1 wrote:Sanctuary sell a chain tensioner that bolts to the LH centre stand bracket to keep tension more stable as the shock extends. Link below.

http://www.noblest.co.jp/products/detail105.html

Does anyone know where I can get one of these or something similar in the UK or EU ??

regards
Howie

I would phone Ray Debben, Debben performance, Ringwood.

look in Ginger bears project.....he made one!

Here is the one I made earlier.......

Ginger Bear wrote:

Do you know the dimensions for this chain adjuster ?

Sorry Adrian, no dimensions. I used a cardboard template to ensure everything worked out. Needed to make the angle fairly acute so the thing didn't foul on the frame cross member.
Wheel is a 'turned down' skateboard wheel.
Bike has now gone to a new home, so I can't even go out & measure it for you.

Ginger Bear wrote:Sorry Adrian, no dimensions. I used a cardboard template to ensure everything worked out. Needed to make the angle fairly acute so the thing didn't foul on the frame cross member.
Wheel is a 'turned down' skateboard wheel.
Bike has now gone to a new home, so I can't even go out & measure it for you.

Thanks for letting us know. GB