18" rear wheel in ETZ251?

ETZ(including Kanuni), ETS, ES, TS, IFA-RT, BK, Saxon,

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18" rear wheel in ETZ251?

Postby Puffs » Tue Jan 16, 2018 12:14 pm

Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
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Re: 18" rear wheel in ETZ251?

Postby Blurredman » Wed Jan 17, 2018 3:48 am

I'm not sure, but it might require a longer swingarm to accomodate the larger size wheel, and because of that, the wheel would also be further back meaning the rear mud-guard might need to be changed or angled in a way so that the wheel does not hit the mudguard. This will also require a longer chain too, of course. 2 links more. So.. A bit of work required I think.
The rear hub system is the same though.

Can I ask, why would doing this modification fail the MOT? :-)
1972 MZ ES250/2 - 16,000 miles - The project! :)
1979 Suzuki TS185ER - 9,000 miles - Mud :)
1981 Honda CX500B - 91,000 miles - Long Distance :)
1987 MZ ETZ300 - 38,000 miles - Sun :)
1990 MZ ETZ251 - 49,000 miles - Commute :)

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Re: 18" rear wheel in ETZ251?

Postby Puffs » Wed Jan 17, 2018 10:16 am

Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
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Re: 18" rear wheel in ETZ251?

Postby DAVID THOMPSON » Wed Jan 17, 2018 10:49 am

one of my bikes has a 16 inch rear tire .. here in the USA the selection of 16 inch tires is very poor and the 18 inch fronts are all to wide
makes it a pain at new tire time
dave
Dave 2002 MZ RT125+1995 Saxon Tour(500cc)
1997 MZ 660 Traveller+6/13/09 WV USA
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of everything"
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Re: 18" rear wheel in ETZ251?

Postby Blurredman » Thu Jan 18, 2018 6:06 am

UK mot's only really check the safety of a motorcycle, and don't really do red tape like "this rear wheel should be x size for this one year". If you had a later 251, it would have the much larger/longer plastic mudguard. I think you might be able to get away with the centre stand. Possibly... :-D



When it comes to my MOT's, they are shall we say... just a 30 minute chat about motorcycles :lol: :lol:



I also think the 251 is a bit small for me too (I have a 1990 metal rear mudguard too!). The steering is more direct certainly and sure this can be nice in the city, the 250 though is a nice longer bike that somehow seems to hold more confidence with me. The seating position all seems the same, and although I feel like I am sitting 'in' the bike on the 251 owing to the way the tank is shaped, I do feel more bolt upright almost whereas the 250 seems lower. :smt007
1972 MZ ES250/2 - 16,000 miles - The project! :)
1979 Suzuki TS185ER - 9,000 miles - Mud :)
1981 Honda CX500B - 91,000 miles - Long Distance :)
1987 MZ ETZ300 - 38,000 miles - Sun :)
1990 MZ ETZ251 - 49,000 miles - Commute :)

ftp://blurredmanswebsite.ddns.net/Vehicle_Documents/MZ_Documents/
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Re: 18" rear wheel in ETZ251?

Postby Puffs » Thu Jan 18, 2018 7:09 am

Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
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Re: 18" rear wheel in ETZ251?

Postby Eric Frith » Thu Jan 18, 2018 11:35 am

On my ETZ125 I converted it to 18" rear wheel by lacing an ETZ250 rim onto the ETZ125 hub. The fit was then straight forward but to make a nice job of it I moved the swing arm cross piece forward buy an inch, this works well and looks like a factory finish.
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Re: 18" rear wheel in ETZ251?

Postby Eric Frith » Thu Jan 18, 2018 11:40 am

21.08.17 003.jpg
18" Rear wheel
The reason for the 18" rear wheel is to give the bike a higher ride & seat height as I'm just over 6' 2"
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Re: 18" rear wheel in ETZ251?

Postby breakwellmz » Thu Jan 18, 2018 12:26 pm

Hi

If it`s any help many years ago i converted a Supa 5 for off road use.
I had my local MZ/Jawa/CZ dealer replace the original rear 16" rim with an 18" one from a CZ 250 and fitted a 4.00 x 18 trials tyre, i don`t recall any clearance problems.

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Re: 18" rear wheel in ETZ251?

Postby Puffs » Thu Jan 18, 2018 1:37 pm

Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
Last edited by Puffs on Mon Apr 03, 2023 4:14 am, edited 1 time in total.
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Re: 18" rear wheel in ETZ251?

Postby Eric Frith » Fri Jan 19, 2018 10:48 am

That's exactly what I did, but I used a slightly bigger section of box steel rather than the original piece of tube, I'm guessing at about 40mm x 25mm, placed a piece of large studding through the pivot end and the same at the other end to keep everything in place. Cut, ground and then welded, gave it a little tweak in the vice and then painted it.
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Re: 18" rear wheel in ETZ251?

Postby Puffs » Sat Jan 20, 2018 6:27 am

Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
Last edited by Puffs on Mon Apr 03, 2023 4:14 am, edited 1 time in total.
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Re: 18" rear wheel in ETZ251?

Postby Puffs » Sat Jan 20, 2018 7:25 am

Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
Last edited by Puffs on Mon Apr 03, 2023 4:14 am, edited 1 time in total.
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Re: 18" rear wheel in ETZ251?

Postby Blurredman » Tue Jan 23, 2018 10:38 am

I always wondered whether that extra hole at the back of each side of the swingarm was to change shock angle?

What kind of effect does it give?
1972 MZ ES250/2 - 16,000 miles - The project! :)
1979 Suzuki TS185ER - 9,000 miles - Mud :)
1981 Honda CX500B - 91,000 miles - Long Distance :)
1987 MZ ETZ300 - 38,000 miles - Sun :)
1990 MZ ETZ251 - 49,000 miles - Commute :)

ftp://blurredmanswebsite.ddns.net/Vehicle_Documents/MZ_Documents/
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Re: 18" rear wheel in ETZ251?

Postby Puffs » Tue Jan 23, 2018 1:19 pm

Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
Last edited by Puffs on Mon Apr 03, 2023 4:15 am, edited 1 time in total.
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