anyone good at maths/figures?

[elwellnick24]

not sure wether to put this here or in autos, but i have a slight problem...
to cut a long story short i have decided to use a bycycle speedo on my motorbike, and im having problems entering the code it needs for the circumference of the wheel..
the size of my wheel is 110/70/17, which is not listed in the instruction booklet (not surprisingly!)
the ones that are listed that are similar-ish are -
700 x 18c
700 x 20c
20 x 1.75 x 2
there are lots more but they are for 26" wheels so i dont think they are relevent.
anyway, could anyone here tell me if my wheel would work out to be close to any of the measurements given above...im useless at these kind of things!
cheers, nick  :)

[Omag 2.0]

Just buy new wheels and let us lot get drunk...  ;D

[Fozzer]

Nick...

If this "Motorcycle?" of yours is going to be used on the highway it will require the correct manufacturers speedometer to be fitted, otherwise it is doubtful if it will register the correct speed when in a speed restricted zone, and an Officer of the Law will be feeling your collar....
...assuming the machine passes it's MOT in the first place without a propper speedometer*...?

The size of the wheel you specified tells me that the motorcycle is a fairly large road machine, and I wonder why it doesn't have a correct speedometer fitted already...?

*Motor Vehicle speedometers are designed to freeze at the moment of impact in a collision, for speed inspection purposes, and I doubt if a simple bicycle speedometer would meet those legal requirements.

Cheers Nick...!

Paul...get a propper 'bike... ...!
LOL... ...!

[elwellnick24]

lol!
hi paul!  ;D
im fitting this speedo because the speedo drive's keep failing, and at 40 quid a pop its getting a bit silly now..apparently aprilias are famed for it...
ive been informed it would be legal to fit a pushbike speedo, but after what youve said i reckon i'll investigate further...
anway, once i have a working speedo do you fancy a ride out?  :)

[Fozzer]

lol!
hi paul!  ;D
im fitting this speedo because the speedo drive's keep failing, and at 40 quid a pop its getting a bit silly now..apparently aprilias are famed for it...
ive been informed it would be legal to fit a pushbike speedo, but after what youve said i reckon i'll investigate further...
anway, once i have a working speedo do you fancy a ride out?  :)

...speedo drive keeps failing... ...!

Do like all us skilled motorcycle mechanics do...
Take the inner cable out and grease it regularly!, and make sure there are no tight bends in the outer cable run from the speedo head to the front wheel gearbox....
...and grease the gearbox next time you take the front wheel out, because a seized gearbox will also break the speedo cable...!

Here endeth the first lesson in motorcycle mechanics......!

LOL...!

Cheers Nick...!

Paul....Brmm....brmm... ...!

[Brett_Henderson]

Talk about furlongs per fortnight ! And any other example of dimensions given it THE least useful format  ;D

110/70/17 .. Is this like a traditional, automobile tire size (110mm tread,  70 series, 17-inch rim) ? (I never understood why they mixed inches AND millimeters there)..

Anyway.. what I remember from this stuff, is that the "code" you need to enter is; the circumference of the tire in millimeters. Just carefully  measure the diameter and multiply by 3.14. Or.. draw a chalk-line on the sidewall and on the pavement; roll the bike forward one revolution and mark the pavement again; measure the distance between the two marks. Then, ride side-by-side with another biker to fine-tune your speedometer against his (if yours reads too low, increase the code accordingly, etc.)

[Fozzer]

Talk about furlongs per fortnight ! And any other example of dimensions given it THE least useful format  ;D

110/70/17 .. Is this like a traditional, automobile tire size (110mm tread,  70 series, 17-inch rim) ? (I never understood why they mixed inches AND millimeters there)..

Anyway.. what I remember from this stuff, is that the "code" you need to enter is; the circumference of the tire in millimeters. Just carefully  measure the diameter and multiply by 3.14. Or.. draw a chalk-line on the sidewall and on the pavement; roll the bike forward one revolution and mark the pavement again; measure the distance between the two marks. Then, ride side-by-side with another biker to fine-tune your speedometer against his (if yours reads too low, increase the code accordingly, etc.)

...or apply Fozzers simple method...
..don't be a tight arse, order a new inner cable from the motor bike shop
Grease, and re-insert a new inner cable in the speedo drive...
...instant satisfaction... ...!

All this mathematical malarkey will only give you a headache, and risk getting you into trouble with PC Plod when he eyes up that strange looking speed-measuring device clipped to your handlebars where the propper device should be located... ...!

I hope that the Worcestershire Constabulary don't lean too heavily on you......!
LOL...!

Cheers Nick...!

Paul... ...!

P.S. What Make/Model is your trusty steed...?

[Brett_Henderson]

Fozz is right.. Don't skimp when it comes to vehicle safety. I just got caught up in solving a math dilema (it's a weakness of mine).. lol

[Hagar]

im fitting this speedo because the speedo drive's keep failing, and at 40 quid a pop its getting a bit silly now..apparently aprilias are famed for it...

That seems a tad expensive but in my experience it's false economy to replace the inner drive only. A worn outer can cause new inners to fail long before they should. If this is a known problem there must be a reason for it. I suspect it's more to do with the routing of the drive assembly rather than the drive itself. Make sure there's no sharp bends at all normal steering positions which could cause undue wear & reroute the complete cable if necessary. Of course, proper lubrication is always big help.

[Mynameisnemo]

Hi Nick,
i'll have a word with a friend of mine who owns a rg125 wolf as he has a bycycle speedo fitted to his which has been ok'd by the police round bolton, and see if he can help you out with this problem.

Nemo.........

p.s is it the aprillia rs series that has the speedo problem?

[Fozzer]

Hi Nick,
i'll have a word with a friend of mine who owns a rg125 wolf as he has a bycycle speedo fitted to his which has been ok'd by the police round bolton, and see if he can help you out with this problem.

Nemo.........

p.s is it the aprillia rs series that has the speedo problem?

It is a well known fact that the Manchester Plod are not too concerned regarding Law infringements regarding motorcycles, knowing as they do that, that in a very short space of time the offending machine will be popped into the back of an unmarked, stolen van, and carted off to be stripped down for various parts to be sold off in the local rag, or e-Bay, whichever causes the least suspicion.

Now the Worcestershire Constabulary, being located somewhat further south from Manchester, and therefore more intelligent, are generally more concerned regarding the well being of motorcyclists, and will happily give friendly advice regarding the fitting of attachments, legal or otherwise to the said machine whilst supplying copious cups of tea and chocolate cookies, down at the Station.

The vision of a brand new speedometer drive displayed before the Desk Sergeants eyes will no doubt instill complete satisfaction that you are abiding by the Law in accurately observing the County speed limits with the aid of your new, legal speedometer/odometer drive attached to your legal, manufacturers speedometer/odometer, and will be a good boy in future.

...and don't forget to pop 50 Pence in the tin on your way out, (in aid of the Policeman's Christmas Ball).

Cheers Nick...!

..and remember, Nemo will get you into trouble, 'cos he comes from Manchester, and that's what they do in Manchester, as well as lift Motorcycles in unmarked, stolen vans, during the hours of darkness....  :'(...!

Paul...Studying the Road Traffic Acts.... ...!

[elwellnick24]

yes mate, its an rs...
i actually saw a copper today in the supermarket of all places and asked him about this, he said its fine to use one, and he also said, along with a mechanic friend of mine, that they are also more accurate than than the factory fitted ones.  :)

[Mynameisnemo]

[quote]
..and remember, Nemo will get you into trouble, 'cos he comes from Manchester, and that's what they do in Manchester, as well as lift Motorcycles in unmarked, stolen vans, during the hours of darkness....

[Fozzer]

Not From Manchester Paul, actually from Runcorn which is near Liverpool  :-*,

nemo.......
*after one bike got pinched and torched, the next one isn't able to be moved without the alarm going off*

Tee-Hee...

You are still much too close to Manchester!
Anyone living in and around that area, and speaking in a Manchester/Liverpool accent are bound to be a bit on the "dodgy" side... ...!
LOL...!

We have similar problems with thieving toe-rags living in Bristol and Cardiff.... ...!

Note: My

[H]

...lost two very expensive Super-Bikes to thieves!

Sorry to see that, Foz. Material or not, some of us have emotional attachments to certain things that replacing them just doesn't account for. At the moment, I happen to be wearing a shirt that I wouldn't throw away when I found it ripped at the bottom -- the only shirt I've ever personally gotten the cloth and made, myself -- and added a band along the bottom to replace the bad section. However, more expensive items had gone out the door (I was half a continent away at the time) that still haven't been replaced (audio/video equipment, etc.). ...But when it's your car ...or bike :'(  ...that's quite a few horses, isn't it? Aren't horse thieves supposed to be hanged?>:( Nevertheless, it rather explains your, perhaps, "simmered," disposition.

...You are still much too close to Manchester!

Strange... many New Hampshirites say the same... about our largest city named for the same.

8)