3.5 inch front rim on an older ST1100

Ronni.N

Joined
Jun 30, 2024
Messages
10
Age
45
Location
Denmark
Bike
Honda ST1100 1993
Hi.

I seem to remember somebody here swapped the stock 3.00 rim to a 3.5 from a newer ST1100 ABS2 model, is it a direct swap, or is anything else needed from the newer style bike, i only have the rim and the abs ring.

Im guessing the brake discs from the 3.00 fits directly, what about spacers and such for the fork ?

Kind regards
Ronni
 
the ABS2 rotors and calipers are different from the non-ABS, and I think the fork tube diameters are different too. I think you'd need to swap the triple clamp, forks, wheel, calipers, and rotors, and probably the spacers too like you mentioned. Not sure about the axle, that might be different too.

Uncle Phil has done this I believe, so he should be around shortly to clarify if anything I said is incorrect.
 
I think that you may need to look at the microfiches for the bikes that you are looking to compare.
Am I right in believing that the ABS 2 system was fitted to the ABS/CBS bikes - the ones with 3 piston calipers ?
If it was fitted to the later 2 piston caliper models with ABS - then I don't know which year models these are.

The wheel by itself is not listed separately - it is a wheel set. But the two that I just looked at - out of curiosity for a 1993 ST1100 and a 1997 ABS/CBS version (both European) show the following differences/similarities
Bearings are the same
Brake discs are different
Tyre is different (110/80-V18 vs 120/70 ZR17
Axle is the same
Speedo gearbox is different
Distance collar - fitted between bearings - is different.

I guess that most of these can be mitigated by fitting the appropriate mating components - eg the distance collar must match the wheel oherwise undue stress could be put on the wheel casting when the axle bolt is tightened - but the lebgth of the axle is the same.
The tyre 110/80 is 110mm wide and 88mm tall. The wheel is 18" diameter.
The Tyre 120/70 is 120mm wide and 84mm tall. The wheel is 17" diameter.

So you would have a taller tyre fitted on a larger diameter rim. for the 110/80 - 18 . Might there be a mudguard clearance issue ?

Maybe that is why the front wheel needs a different gearbox for the speedo ?
 
dwalby said:
Uncle Phil has done this I believe, so he should be around shortly to clarify if anything I said is incorrect.
Click to expand...
Lets hope he will chime in. :)

jfheath said:
I think that you may need to look at the microfiches for the bikes that you are looking to compare.
Am I right in believing that the ABS 2 system was fitted to the ABS/CBS bikes - the ones with 3 piston calipers ?
If it was fitted to the later 2 piston caliper models with ABS - then I don't know which year models these are.

The wheel by itself is not listed separately - it is a wheel set. But the two that I just looked at - out of curiosity for a 1993 ST1100 and a 1997 ABS/CBS version (both European) show the following differences/similarities
Bearings are the same
Brake discs are different
Tyre is different (110/80-V18 vs 120/70 ZR17
Axle is the same
Speedo gearbox is different
Distance collar - fitted between bearings - is different.

I guess that most of these can be mitigated by fitting the appropriate mating components - eg the distance collar must match the wheel oherwise undue stress could be put on the wheel casting when the axle bolt is tightened - but the lebgth of the axle is the same.
The tyre 110/80 is 110mm wide and 88mm tall. The wheel is 18" diameter.
The Tyre 120/70 is 120mm wide and 84mm tall. The wheel is 17" diameter.

So you would have a taller tyre fitted on a larger diameter rim. for the 110/80 - 18 . Might there be a mudguard clearance issue ?

Maybe that is why the front wheel needs a different gearbox for the speedo ?
Click to expand...
The front should still be a 18" even on the new ABS2 bikes, only difference should be its 3.5 wide instead of the 3.00 on the old, i know its possible to mount a 120/70-18 tyre on the old style 3.00 rim, but it will be a bit squished so a better choice seems to swap the rim for the newer style 3.5.

I am not sure if the 3.5 rim was used on anything else than the ABS2 versions with the 3 piston brake calipers, i dont think so since i was looking at a rim for a 1999 Pan and it was the 3.00 type.

If the bearings, axle and collar is the same I would think there should be a chance the old speedodrive also would fit to the new rim, maybe the difference is something to do with the newer style forks on the ABS2 modeles ?
 
The 3.5 rim fits without modification on a standard.
All you have to do is swap the discs from the standard wheel to the ABSII wheel (they fit also).
There is plenty of clearance for the ABSII size tire which is the same as the ST1300 size.
If you wanted the whole deal, it requires swapping the triple tree, the forks, getting an ABSII front fender (front and back), ABSII calipers and deciding if you want to 'activate' the center pucks or not.
Been there, done that, and have converted my standard to a full ABSII. ;)
 
Uncle Phil said:
The 3.5 rim fits without modification on a standard.
All you have to do is swap the discs from the standard wheel to the ABSII wheel (they fit also).
There is plenty of clearance for the ABSII size tire which is the same as the ST1300 size.
If you wanted the whole deal, it requires swapping the triple tree, the forks, getting an ABSII front fender (front and back), ABSII calipers and deciding if you want to 'activate' the center pucks or not.
Been there, done that, and have converted my standard to a full ABSII. ;)
Click to expand...
Perfect, thank you for the reply.

Im not going that wild, i just want a 3.5 rim for the 120/70-18 tire, the bike is already an ABS version, but ABS1.
 
Ronni.N said:
Perfect, thank you for the reply.

Im not going that wild, i just want a 3.5 rim for the 120/70-18 tire, the bike is already an ABS version, but ABS1.
Click to expand...
All front rims for the ST1100s are 'interchangeable' (I've had my hands on all three types and tried them. ;))
If your ABSI is functioning, I don't know if the ABSII ring is the same and in the same position as the ABSI.
IIRC, the sensors are the same so it may be.
Unless you have to fuss with vehicle inspections, the 120 tire fits fine on the 110 rim without issues (done that also).
 
The ABS rings are the same partnumber for the ABS1 and 2 systems, so only difference can be where its mounted in relation to the calipers since the ABS2 is using a different type and im guessing also a different spot for the ABS sensor.
 
Ronni.N said:
The ABS rings are the same partnumber for the ABS1 and 2 systems, so only difference can be where its mounted in relation to the calipers since the ABS2 is using a different type and im guessing also a different spot for the ABS sensor.
Click to expand...
If the rings are the same, then you would think the position of the rings would probably be the same unless the offset is different because of the wider rim. The location of the sensor (on the diameter of the circle) would make much difference. I know I've ran 170/60 rear tires instead of 160/70 (had no choice at the time) and the ABSII system never flinched! ;)
 
Uncle Phil said:
If the rings are the same, then you would think the position of the rings would probably be the same unless the offset is different because of the wider rim. The location of the sensor (on the diameter of the circle) would make much difference. I know I've ran 170/60 rear tires instead of 160/70 (had no choice at the time) and the ABSII system never flinched! ;)
Click to expand...
I will give an update when the rim is received, hopefully everything will mount straight up to the old 93 Pan, its soon motorcycle season. :wht11:
 
Looking at the parts diagram, it appears the ABS front sensor is built into the caliper mount.
The ABSII front sensor is mounted a little higher on the brake bracket with an alignment 'pin' for positioning.
What I found strange was the front ABSII discs are smaller than the standard/ABSI discs.
But as I said, the mounting holes are exactly the same.
 
Uncle Phil said:
Looking at the parts diagram, it appears the ABS front sensor is built into the caliper mount.
The ABSII front sensor is mounted a little higher on the brake bracket with an alignment 'pin' for positioning.
What I found strange was the front ABSII discs are smaller than the standard/ABSI discs.
But as I said, the mounting holes are exactly the same.
Click to expand...
It is, but since my ABS sensor anyway is from china, it should be possible to make adjustments if needed, i am hoping everthing will line up, but time will tell if im that lucky.

The rim with tire and ABS ring was only 45 dollars, so for that price its worth a try.
 
You must log in or register to reply here.
Back
Top Bottom