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Rolling with the Himmies

Alan F.

Well travelled
I was thinking about ABS functionality with the 21" front wheel. After a brief search I found that Arlen Ness sells a tone ring for converting several bikes from 18" to 21" wheels, not at all reassuring.
So I went to Hitchcocks partsbook and took screen shots of the Inty and Himmy front tone rings, both of which count 48 holes and 48 spokes. The missing bit of info is the diameter of each tone ring. It could be that the Himmy tone ring has a larger diameter than the Inty's tone ring, and the ratio of ring diameter to wheel diameter is the same on both setups.

I think I'll ask around to see if a Himmy owner will measure their tone ring. Stay Tuned.


6 mounting holes for Himmy, 5 for Inty.
1600016001
 

Alan F.

Well travelled
I finished the 21" wheel, mounted and balanced the P-rated 2.75x21 Shinko 244 but I haven't put it on my Interceptor yet.
I picked up a Himmy fender and Pyramid extender so I can paint it silver to blend in with the Orange Crush theme if everything works out... I'm interested to see if the ABS will play along, or if I'll have to rig a Himmy tone ring. (or ride with the ABS fuse out) I don't care much about the speedometer being a little off.
17644

It's been a busy Spring at work so I'm just getting my bike ready to ride now, battery back in on 1 June and it fired right up. Then I pumped up the tires and took a good look at them, nope.

Front has cracks and rear is too far gone to care about.
1764517646

So on with the Shinko 244s and IRC tubes I originally bought. 4.10x18 front went on without scratching the rim or hurting myself.
It's just a touch larger than stock.
17655

17656

I figure I'll swap out the rear a bit at a time instead of doing the whole job in one go the way I did the front.

I really recommend these small scissor table jacks, for about $50 US shipped & it weighs about 28lbs, it made removing the front wheel simple. (1200lb supposed capacity, eBay, Amazon, Temu, etc) my 24mm socket for the axle nut will turn the jack's hex head, it is an over-large fit but works without any worry of slippage.
17657

Stay tuned.
 

BlackdogADV

Well travelled
I finished the 21" wheel, mounted and balanced the P-rated 2.75x21 Shinko 244 but I haven't put it on my Interceptor yet.
I picked up a Himmy fender and Pyramid extender so I can paint it silver to blend in with the Orange Crush theme if everything works out... I'm interested to see if the ABS will play along, or if I'll have to rig a Himmy tone ring. (or ride with the ABS fuse out) I don't care much about the speedometer being a little off.


It's been a busy Spring at work so I'm just getting my bike ready to ride now, battery back in on 1 June and it fired right up. Then I pumped up the tires and took a good look at them, nope.

Front has cracks and rear is too far gone to care about.


So on with the Shinko 244s and IRC tubes I originally bought. 4.10x18 front went on without scratching the rim or hurting myself.
It's just a touch larger than stock.


View attachment 17656

I figure I'll swap out the rear a bit at a time instead of doing the whole job in one go the way I did the front.

I really recommend these small scissor table jacks, for about $50 US shipped & it weighs about 28lbs, it made removing the front wheel simple. (1200lb supposed capacity, eBay, Amazon, Temu, etc) my 24mm socket for the axle nut will turn the jack's hex head, it is an over-large fit but works without any worry of slippage.


Stay tuned.
so this picture is of the 21” wheel?
 

Alan F.

Well travelled
In the first Pic the 21 is on the stand next to the bike, I peeled off the cover for that photo a month or 3 ago.

The side by side photo is the stock 100/90-18 next to the 4.10x18 which is now on my bike.
 

Alan F.

Well travelled
Tonight I removed the rear wheel, followed by removing the worn out Pirelli and stock tube.

I scratched the rim in a few spots, not too happy about it but there it is. I'll get the new tire mounted ASAP. Swapping tires sure is a workout.
 

Alan F.

Well travelled
Late this afternoon I was able to get the new rear tire mounted. It's also a Shinko 244, 5.10x18 also with a new IRC tube. I let it bake in the black suv all day and got to it around 4pm.
I powdered the tire and tube as before and this one didn't put up a fight.

It's 1.5 inches taller than my worn out Pirelli
17669
 

Woodstock

Well travelled
Location
Woodstock, NY
I finished the 21" wheel, mounted and balanced the P-rated 2.75x21 Shinko 244 but I haven't put it on my Interceptor yet.
I picked up a Himmy fender and Pyramid extender so I can paint it silver to blend in with the Orange Crush theme if everything works out... I'm interested to see if the ABS will play along, or if I'll have to rig a Himmy tone ring. (or ride with the ABS fuse out) I don't care much about the speedometer being a little off.
View attachment 17644

It's been a busy Spring at work so I'm just getting my bike ready to ride now, battery back in on 1 June and it fired right up. Then I pumped up the tires and took a good look at them, nope.

Front has cracks and rear is too far gone to care about.
View attachment 17645View attachment 17646

So on with the Shinko 244s and IRC tubes I originally bought. 4.10x18 front went on without scratching the rim or hurting myself.
It's just a touch larger than stock.
View attachment 17655

View attachment 17656

I figure I'll swap out the rear a bit at a time instead of doing the whole job in one go the way I did the front.

I really recommend these small scissor table jacks, for about $50 US shipped & it weighs about 28lbs, it made removing the front wheel simple. (1200lb supposed capacity, eBay, Amazon, Temu, etc) my 24mm socket for the axle nut will turn the jack's hex head, it is an over-large fit but works without any worry of slippage.
View attachment 17657

Stay tuned.
I bought a table scissor jack such as you have. I had points, a coupon and it was already supposedly discounted so $18 all up. Sounds like a deal to me. Just slow shipping. If it is not 24mm, what size is it?
 

Alan F.

Well travelled
This afternoon I checked chain alignment. (why didn't I buy this tool years ago?)
Cleaned and lubed the chain, bled the rear brake and bolted on a set of crash bars / leg guards. Not genuine RE, but the same brand as my rear rack.

17808
17809178101781117812
 

Alan F.

Well travelled
I've got about 370 miles on these tires now and they've been nothing but fun on clean, dry, hot pavement. I'll say more when I've ridden in the wet or off the pavement.
 
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Alan F.

Well travelled
Time for an update, in June I put nearly 1500 miles on these tires riding with BruceH and Woodstock. Since then its been hiding under its cover, waiting...

This weekend is Rice-o-Rama, New England's largest Japanese only Vintage Motorcycle event, and I'm riding there this year after missing it last year.
 

Alan F.

Well travelled
To compare tire sizes I like to use:
Inputs are in millimeters, but the outputs are shown in both inches and millimeters, so its easy to compare directly.

On Interceptor and Continental GT
Stock 100/90-18 front and 130/70-18 rear calculate to 0.3% larger on the rear.

For my situation, mind you I haven't fitted this wheel to my bike yet...

Swapping from stock 100/90-18 front to a 2.75×21, calculates out to an 8.6% increase in both diameter and circumference, that's from stock.

But on my bike now, and proven to work,
I have swaped from:
stock front 100/90-18 to 4.10x18 which measures to about 2% larger.
and
for the rear tire I have swapped from stock 130/70-18 to 5.10x18 which
measures to about 5.25% larger.
I have about 1500 miles on these with no ABS issues.


And I'm rolling and braking without issues with a 10% larger rear than front.

If i swap on the 21 that I built, that difference should drop to 3.4% which should also work well.


Stock are 0.3% larger rear
4.10FR/5.10RR=7.3% larger rear

100/90-18= 25.09" diameter
130/70-18= 25.17" diameter
4.10x18= 25.75" diameter
5.10x18= 26.50" diameter
2.75x21= 27.50" diameter

Front tire diameter changes:
100/90-18 to 4.10x18
Gave a 2.8% increased diameter from 25.09" to 25.78"

100/90-18 to 2.75x21
Gave an 8.80% increased diameter from 25.09" to 27.30"

Rear tire diameter changes:
130/70-18 to 5.10x18
Gave a 5.28% increased diameter from 25.17" to 26.50"

5.10x18 Rear + 4.10 Front
Gives a 2.91% larger Rear Tire

5.10x18 Rear + 2.75x21 Front
Gives a 3.63% larger Front Tire

Ground clearance with stock tires is listed by RE as 174mm or 6.85"

Rear ground clearance with 5.10x18 is up 16.89mm or 0.665"

Front ground clearance with 4.10x18 is up 8.38mm 0r 0.33"

Front ground clearance with the 2.75x21 is up 30.6mm or 1.20"

So I'd need to raise the rear 13.17mm or 0.54" to level the chassis as stock.

But thats before suspension mods begin...

Re: Vulcan's Hunter with a Meteor front wheel thread

With concern to ABS functionality, I've been going over calculations of the tire diameter changes I've made on my bike.
Stock size Pirellis or Ceats on Interceptor or Continental GTs have a 0.3% larger rear tire diameter.

With my Shinko 244s
4.10 front and 5.10 rear
I have a 7.3% larger rear tire diameter.
*with no adverse effects from the ABS.

On to the 21" front I've built.
The Shinko 244s 5.10x18 rear and 2.75x21 front will give me a 3.63% larger front tire diameter.
 

Alan F.

Well travelled
The above was cut and pasted from OneNote with great difficulty and frustration, and I'm just not able to edit it.

So with the 21" wheel mounted i can expect the rear of the bike to be 5/8" lower than the front, and the front will be 1.2" higher than stock (measured at front axle). I'll have to compare this info to some dirtbikes and ADV bikes to see if it's even in the ballpark. No suspension mods yet mind you.

All of this was promted by a thread from a member called Vulcan who fitted a 19" Meteor 350 front wheel to his His Hunter 350 and experienced some ABS malfunctions... I'll have to crunch the numbers to see what percentage above stock wheel/tire diameter he was working with.
 

Woodstock

Well travelled
Location
Woodstock, NY
Time for an update, in June I put nearly 1500 miles on these tires riding with BruceH and Woodstock. Since then its been hiding under its cover, waiting...

This weekend is Rice-o-Rama, New England's largest Japanese only Vintage Motorcycle event, and I'm riding there this year after missing it last year.
I'm still hopeful we will run into you there but will depend on the truck. As discussed, can't make a mistake on the weather if two-up.
 

Alan F.

Well travelled
All of this was promted by a thread from a member called Vulcan who fitted a 19" Meteor 350 front wheel to his His Hunter 350 and experienced some ABS malfunctions... I'll have to crunch the numbers to see what percentage above stock wheel/tire diameter he was working with.

Hunter 350
Ground clearance 150mm
Front Tire 100/80-17
23.30" diameter
Rear Tire 120/80-17
24.56" diameter

Meteor 350
Ground clearance 170mm
Front Tire 100/90-19
26.09" diameter
Rear Tire 140/70-17
24.72" diameter

The 19" Meteor front is 26.09"
The 17" Hunter front is 23.30"

2.79" difference in diameter.
That's 1.395" or 35.43mm taller ride height at the front of your bike.

*11.974% change in front wheel diameter from the 17 to the 19.
Tire size is the deciding factor.

If the Meteor's 140/70-17 tire fits on the rear of a Hunter, the difference in front to rear tire diameters drops to 5.542%

Meteor rear is 5.542% larger than front.
ABS is happy with that.

Hunter rear is 5.407% larger than front.
ABS is happy with that.

I don't know if the ABS cares about speed, or of it just cares about the percentage of difference in wheel diameter.

*Percentage of difference in wheel diameter is equal to the percentage of difference in wheel circumference between any two wheels.

*Meteor rear wheel width is MT3.50x17
Hunter rear wheel width is MT4.00x17
 

Alan F.

Well travelled
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