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Author Topic: look at what i have been given  (Read 51299 times)
Olds
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« Reply #15 on: November 28, 2017, 09:26:10 PM »


You still got your sense of humor   Cheesy

I need it more and more.

As Terry says a Reliant axle from an 850 especially a Rialto 2 shouldn't be too far off the right ratio and this can be compensated for by the tyre diameter. It's probably the easiest conversion and would not need MSVA if done correctly.
If I can make a hardtail comfy enough for me, then having rear suspension  should make it OK for most folk.
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Getting older but no wiser! Just using bigger hammers.
The answer to most problems, fire and lots of it.
merv
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« Reply #16 on: November 29, 2017, 11:13:46 PM »

Would anybody know what the mx5 final diff ratio would be. Knowing that would determine which axle to go for.
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Why do every five minute job take all day, and
if it can go wrong it will go wrong
stinkey
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I can't stop building stuff ?,but I'm slowing down


« Reply #17 on: November 29, 2017, 11:35:54 PM »

Google it Merv
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Backyard hotrodder,learnt by mistake,still learning ?
Olds
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« Reply #18 on: November 30, 2017, 05:54:57 AM »

Like the Reliant axles there isn't a single ratio it depends on engine/wheel size model/year but for NA NB & NC models they are roughly  3.6:1 3.7:1 3.8:1 4.1:1 4.3:1 (i think)
The best one 3.636 :1 was fitted to 2001-2005  sport models with the six speed box but being a LSD they are expensive SH. Most of the ones around are the 4.1 & 4.3:1.
Hope this helps.
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Getting older but no wiser! Just using bigger hammers.
The answer to most problems, fire and lots of it.
stinkey
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I can't stop building stuff ?,but I'm slowing down


« Reply #19 on: November 30, 2017, 08:02:38 AM »

Now you've confused him and me with all those figures  Roll Eyes
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Backyard hotrodder,learnt by mistake,still learning ?
Olds
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« Reply #20 on: November 30, 2017, 10:01:09 AM »

If you know the speed you want to achieve at a certain RPM with a certain tyre size, or wish to adjust the tyre size because the diff isn't quite the right ratio, here is a tyre size, diff ratio, engine speed, RPM calculator. (assuming a 1:1 top gear)
http://www.advanced-ev.com/Calculators/TireSize/
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Getting older but no wiser! Just using bigger hammers.
The answer to most problems, fire and lots of it.
terry t
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« Reply #21 on: November 30, 2017, 01:43:25 PM »

Wheels and Diff for a st1100
Merv you need to keep as close as possible to the original st1100 set up for wheel size and diff other wise the gearing and revs will be way out

The rear tyre on the st1100 is a 160/70/17 with a diameter of 655mm
Final drive ratio is 2.8

So you are looking for A diff ratio of 2.78 or 3.23 (reliant axles) are the closest

I would be inclined to go for one around the 3.00 mark but no more than 3.5 ratio

IRS type ford 3.9 I think they do a 3.6. or mazda 3.6 or a 3.9 both need a cradle for the diffs and wish bones for the hubs.  as Dave has said both these are rare and expensive there is others out there

Wheels and tyre sizes need to be
225/60/15 651mm diameter
225/50/17 656mm diameter

do all your home work first Mate as once done that it

All of the st1100 I've seen have had swing arm with axles fitted

If there's one near you go round to a car breakers and see what type of axles are about. then check what ratio they are

Ask paulywomdats what diff and wheel he fitted to he's st1100

Or you can give it to me and I will put a jag axle in it Grin
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merv
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« Reply #22 on: November 30, 2017, 07:01:44 PM »

HELP, my head is spinning with numbers, Got to be honest non of it makes a lot of sense to me, sorry.
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Why do every five minute job take all day, and
if it can go wrong it will go wrong
terry t
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« Reply #23 on: November 30, 2017, 07:23:44 PM »

HELP, my head is spinning with numbers, Got to be honest non of it makes a lot of sense to me, sorry.

Merv simple numbers for you. A reliant 3.23 axle.  225/60/15 wheels. air shocks. padded seat cant go wrong Wink
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paulywombats
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« Reply #24 on: November 30, 2017, 08:55:08 PM »

Hey Merv

I have gone with a 'A' reliant axle and 17" wheels off a rover, new tyres came with them 205/45 17.

I have only had it round a car park near my place, so unable to comment on speeds etc.

Most of the one's I've seen for sale use 17" wheels and 'A' axle, so must be somewhere close.

I think a 'B' axle would be as close to final ratio as you could get using a reliant axle.

There is a ST1100 on evilbay with IRS. Item number 322902879197
« Last Edit: November 30, 2017, 09:08:17 PM by paulywombats » Logged

I thought I was wrong once, it turned out I was incorrect!
Living on a wing and a weld
terry t
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« Reply #25 on: November 30, 2017, 09:32:10 PM »

Hey Merv

I have gone with a 'A' reliant axle and 17" wheels off a rover, new tyres came with them 205/45 17.

I have only had it round a car park near my place, so unable to comment on speeds etc.

Most of the one's I've seen for sale use 17" wheels and 'A' axle, so must be somewhere close.

I think a 'B' axle would be as close to final ratio as you could get using a reliant axle.

There is a ST1100 on evilbay with IRS. Item number 322902879197

Looks nice. do the paniers hinge down or a lift of lid. and how much higher does it sit on the rear compared to a bike? 
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paulywombats
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« Reply #26 on: November 30, 2017, 09:37:50 PM »

The panniers hinge down, even with the mudguards on. Don't open fully but plenty of access. The panniers lift off easily.

I made it the same seat height as the bike 800mm.
« Last Edit: November 30, 2017, 09:40:07 PM by paulywombats » Logged

I thought I was wrong once, it turned out I was incorrect!
Living on a wing and a weld
merv
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« Reply #27 on: November 30, 2017, 10:22:11 PM »

Thanks paulywombats

had a look at the one on ebay, i like the look of that irs, i wonder which one they used ?
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Why do every five minute job take all day, and
if it can go wrong it will go wrong
merv
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« Reply #28 on: November 30, 2017, 10:25:12 PM »

Hi paulywombats

Have you any pictures of how your swing arm fits with the drive shaft, just so i can see it how it all goes
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Why do every five minute job take all day, and
if it can go wrong it will go wrong
spanners
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« Reply #29 on: December 01, 2017, 01:06:06 AM »

Hi paulywombats

Have you any pictures of how your swing arm fits with the drive shaft, just so i can see it how it all goes
Just buy an old CX project and use the bits
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LIVE FAST  and  DIE YOUNG,,  past 50 AND STILL HERE  NOW. WAITING. FOR. THE. GRIM. REAPER
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