Thruxton wheel swap - Triumph Forum: Triumph Rat Motorcycle Forums
Air Cooled Twins Talk Discussion of Hinckley Triumph Twin related matters and topics.

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post #1 of 7 (permalink) Old 05-01-2018, 11:11 AM Thread Starter
Minitwins
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Thruxton wheel swap

Hi,
I have changed the wheels on my 2015 900 Thruxton, to alloy’s from a bonnie se.
The reason for doing it was twofold one to get a 17 inch front wheel which gives me more choice of tyres.
And second to get rid of inner tubes. Plus I think it looks better, but that’s my opinion.
Also I had seen a 17 inch front wheel brand new with the smallest mark on the rim from a triumph dealer going for £100, It was a bargain, new cost £600 in the uk. I also picked up a rear from a breaker for £150.
Fitting the rear is a simple swap no changes what so ever.
The front needed a bit of work with the spacing, due to the offset of the Thruxton disk on the wire wheels, compared to the alloys, which is a flat disk
Also the Thruxton has a 320mm disk and the bonnie alloys use 310mm.
So I had to buy a new 310mm disc with no offset £95.
The large spacer from the wire wheels fitted on the opposite side on the alloys so that was no problem.
On the disk side, I had to get a longer spacer made about 6mm to give clearance for the disc and calliper.
I have a pretech calliper and that need some modifications to the mounting bracket, to make the pads grab the disk correctly due to the 310mm smaller disk.

The front mud guard bracket needed some fabrication to lower it for cosmetic reasons due to the 17 inch wheel.
The mud guard mounting bracket acts as a folk brace so you still need it.
The plan for that is to get a fork brace, and to make new mounting brackets, so the mud guard will fit even better.
Next action was to make sure everything was lined up straight back wheel to front.
Using two straight edges I set about it and found them way out of line.
So next was to check how aligned the chain was from the rear sprocket to the front sprocket, I use a laser tool and found it to be half the width of the chain out of line, quick adjustment and this brought everything in line perfectly.
Looking at the adjuster marks on each side, they are not very accurate, so it was well worth doing.
So far have done over a 1,000 miles and the handling is a lot better turns in much quicker and feels lighter.

Cheers
Neil
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post #2 of 7 (permalink) Old 05-01-2018, 11:28 AM
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I put an 18 inch Thruxton front wheel in my Bonneville with the 19 inch wheel

I ended up putting the mudguard under the fork brace

You have to elongate the holes a bit and I used rivnuts under the mudguard and M5 bolts to secure it to the fork brace

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post #3 of 7 (permalink) Old 05-01-2018, 11:30 AM
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Sounds like it’s easier to “Thruxtonize” a mag wheel, than to “Base Modelize(?)” a Thruxton!


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post #4 of 7 (permalink) Old 05-01-2018, 03:03 PM
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Bike looks great, nice choice for tyres with the 17 on the front now, did you have a link to the disc ?

"So I had to buy a new 310mm disc with no offset £95."

The Pirelli Rosso II in 110/70 goes very nicely on these wheels paired up with an Angel GT in 150/70 on the rear.

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2001 790 Bonnie, TTP stg 1 igniter 8,500 limit, Breathe intake DNA filter no AB baffle, CVK 36,#140main,#42 pilot, NAGB needle no shims,Mix out 1.5t, Dunstall 2 to 1, Devon tubeless wheels 18x3.5 front,rear Talon hub 17x4.25
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post #5 of 7 (permalink) Old 05-01-2018, 03:57 PM Thread Starter
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here is the link were i got the 310mm disc

https://www.triumphparts.gbr.cc/product.php/6798959/
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post #6 of 7 (permalink) Old 10-08-2019, 12:00 PM
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Hey Neilx7, I'm new to the forum here and just posted a similar situation however with a 2014 Bonneville T100 Black. Going to be attempting to fit a 2017 Bonneville T120 Black rear wheel onto my bike (long story, explained on my thread if you check through my profile). If you have a moment to review my post and give me your thoughts and feedback itd be most appreciated; no one here seems to have successfully dealt with this. One other made a post about it, I PMed him... nothing in response. Look forward to your thoughts!
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post #7 of 7 (permalink) Old 10-09-2019, 12:30 PM Thread Starter
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wheel swap

Hi TriumphRider89
i have read you post and it totaly diffrent to what i did, as the rear 17" alloy from the bonny was a straight swap that is why i went with it, so i didn't have to do anything to the rear.

i had to do quite a bit to the front with spacers disc and caliper to make it all fit and line up.

sorry i cant help you with the rear.
cheers
neil
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