XBR drive sprockets

[squirrelciv]

How much can I safely pack the drive sprocket away from the castings before things foul the outer cover??

Reason for asking is I'm trying to get my replacement rear wheel to fit in Abigail. Currently, I'm 10mm out. Hagon inform me that the rim can be moved 6mm in relation to the hub without problems occuring around the spoke drillings, that leaves me 4mm to find at the sprocket end.

SteveH suggested altering the spacings in the cush drive/wheel bearing, however on the Dommie hub there is no room for movement here.

So XBR owners, can I shift the drive sprocket out along its shaft 4mm???

Cheers, Pat.

[themoudie]

Aye Pat,

I don't own one o' they, but the thought did cross my mind!

If you space the sprocket out 4mm, does that mean the lock tab with two bolts which bolts to the sprocket will then obscure rather than seat in the groove machined in the circumfirence of the shaft splines?

Or is that a load of ********? It's just that I use CB175 sprockets on the Duke gearbox and secure them with a locknut on the end of the shaft rather than the two bolt plus plate arrangement Honda intended!

Regards, Bill

[guest7]

Hmmm... I can't say about the sprocket, there are two different types of sprocket mountings on XBR motors, depending on which model you have. In either case you are going to have to play around to make sure it doesn't foul the lockring groove.

Given all the likely trouble you're going to, why not have the builders fit a new rim in the position you actually want it?

GC

[002]

Or Scrap it and start again ?

Review your rear wheel situation ?

Mucking about with the G/box sprocket will cause you problems with secureing the sprocket.
Also loading the bearing in the gearbox,not unless you sort yourself out with an out rigger bearing.

Or find some nice person who is willing and able to modify the sprocket so that it is dished,or make one for you.
But you end up with the possibility of loading up that G/Box bearing again.

Jethro

[squirrelciv]

Given all the likely trouble you're going to, why not have the builders fit a new rim in the position you actually want it?

GC

Reason why not is simple. About £80 for a new rim, that why.
Don't know about you, but I'd try a few ideas out before I readily part with £80. Even if it costs me £40 to solve the sprocket problem, I'm still in profit.

Hear what your saying No 002 but will 4mm really put that much more strain on the bearing/oil seal???

Time for a bit of a think. Hmmm.

[Steve H]

From memory Slipstream supply offset gearbox sprockets for racers running wide rims. They basically take a new sprocket, machine the centre out, then weld the centre from another sprocket to get the desired offset. Welding needs to be very good so not your average DIY job.
There was a place in West Wales that would make sprockets from blanks, not sure of the contact details, Supersprox gave me the contact details.

[J Hop]

Given all the likely trouble you're going to, why not have the builders fit a new rim in the position you actually want it?

GC

Reason why not is simple. About £80 for a new rim, that why.
Don't know about you, but I'd try a few ideas out before I readily part with £80. Even if it costs me £40 to solve the sprocket problem, I'm still in profit.


Time for a bit of a think. Hmmm.

My advice would be cough up the £80, I mean after doing all this work you're not going to turn around and sell the bike in a year or 2 are you ??  Look at it as a long term investment, and you will be able to buy sprockets off the shelf and not have the hassle of having to get them machined up every 18 months.

Just my opinion, but it would make a neater job of it aswell.

[steveC]

If you do decide to go down the new sprocket route, there is a firm called B&C express just up the road from me who use to make  up one off sprockets - they may be able to help.  www.bandcexpress.co.uk

[themoudie]

Aye Pat,

Have you become a Lepidopterist again? ;-)

I to occasionally have that problem, but the old happorth o' tar as the vessel (motorcycle) sinks then springs to mind! ;-)

Kind regards and my condolences for the shared affliction!

Bill

P.S. I suspect the majority of the Members of this Club also suffer the affliction to some degree, if that's any comfort!

[002]

If you do decide to go down the new sprocket route, there is a firm called B&C express just up the road from me who use to make  up one off sprockets - they may be able to help.  www.bandcexpress.co.uk

The last time I asked B&C didnt manufacture G/Box sprockets,only rear.

Jethro

[squirrelciv]

Wise words again from all. S'pose your right really, do the job right, do it once.

[guest27]

Hi All

I have to get 10mm machined off a rear hub - do you want me to save it up and swap it with you? :-)

R

[squirrelciv]

Been back in touch with Hagon and seems I've misunderstood them. Apparently they can shift the rim 10mm at 220mm spoke length, Rim holes can be re-drilled and might even de able to re-use the spokes. They're only question was ensuring there was still an angle on the spoke (ie not vertical off the hub) which with my school boy trigonometry I calculate will be 5' on the inner spokes (currently 8')
If it's just a rim move, then the cost is 42 quid. If it's a re-spoke as well then it's 102 quid.

So all is looking well, I just need a fiddle now to cough up the readies.

thanks for all the thoughts

[guest27]

£42 for a rim move - mmmm need similar on the Triton... thanks for asking the questions

R