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  • Slowen down Posts: 70
    Mid North Coast NSW
    Stock Poster Slowen down
    28 Jan 2020 08:54 PM
    Hi
    This year I want to change the wheels on the SG.
    I have seen some info in other peoples posts but want to get more accurate input if possible.
    People seem to go for 180 rear tyres as I believe 200 won't fit in standard rear guard.
    Has anyone fitted a 190 rear, I have found a Pirelli Diablo 190/50 ZR 17 which could be a contender, For me Pirelli make a great sports tyre like the Rossa 11 on my Duke Diavel.
    Next point would be rim size, standard states 17 x 4.5 rear and 19 x 2.5 front do I just go for same on rear and 21 x 2.5 for front.
    I would assume there needs to be tyre width matching between front and back to keep handling at a premium, like 190 on rear and a 100 on front.
    If I go for a 190 tyre would I need a wider rim, 5 inch, surely if you fit a wider tyre to a standard rim it would change the tyre profile/shape.
    Also do people move to twin discs when changing rims or maybe a big disc kit.
    Want to get some first hand experience on this so I don't hand over the hard earned and get it wrong.
    Cheers







  • steelo Posts: 3089
    Adelaide
    Forum Legend steelo
    28 Jan 2020 09:08 PM
    I wouldn't. Keep the bike as the classic that it is. It'd be nothing to blow 3 or more k upgrading the wheels, bearings, rotors etc. Unless you go CVO wheels or high end aftermarket, who'd know you'd even done anything. Save the money and spend it on fuel.
  • Slowen down Posts: 70
    Mid North Coast NSW
    Stock Poster Slowen down
    28 Jan 2020 09:23 PM
    Steelo old rims are starting to rust in a few spots.
    contiplated having them rebuilt but newys would be nice.
    Needs a bigger bag in the back for sure.
    Don't want anything to over the top though.

  • steelo Posts: 3089
    Adelaide
    Forum Legend steelo
    28 Jan 2020 09:40 PM
    I see now. I imagine there'd be hundreds of suitable rims out there
    I found this on GT
  • Big Steve Posts: 708
    Yarra Ranges
    Performance Poster Big Steve
    29 Jan 2020 10:37 AM
    I would go 21X3.25 up front and run a 21X3.5 tyre
    In the back I'd go 18X5.X and run a 200

    It will fit in your rear guard but you will have to run all wires inside the struts covers

    (Not My Bike)



  • Slowen down Posts: 70
    Mid North Coast NSW
    Stock Poster Slowen down
    29 Jan 2020 06:52 PM
    Thanks for the info
    Steelo sent a message to old mate on GT, see what he comes back with.
    Steve interesting info re the 200 and wiring, my thought is if a 17 inch is used rather than and 18 inch then the clearance would be 1 inch better off all depending on tyre profile i suspect.
    I assume running wiring up the strut covers means drilling throught the guard?
    Power machine and Rolland Sands make some nice lookin mags but may be a bit too much bling for the old SG.
    Maybe some black rims n hubs with polished SS spokes.
    Need to see some pics to get an idea.
    Cheers guys.


  • Big Steve Posts: 708
    Yarra Ranges
    Performance Poster Big Steve
    30 Jan 2020 11:18 AM
    Quoting Slowen down on 29 Jan 2020 06:52 PM
    Thanks for the info
    Steelo sent a message to old mate on GT, see what he comes back with.
    Steve interesting info re the 200 and wiring, my thought is if a 17 inch is used rather than and 18 inch then the clearance would be 1 inch better off all depending on tyre profile i suspect.
    I assume running wiring up the strut covers means drilling throught the guard?
    Power machine and Rolland Sands make some nice lookin mags but may be a bit too much bling for the old SG.
    Maybe some black rims n hubs with polished SS spokes.
    Need to see some pics to get an idea.
    Cheers guys.


    Looking at my strut covers the wires can go inside the cover to the shock mount then behind the shock mount and into the back of the electrical/battery area without drilling.

    For well prices wheels made in any side/style/colour check out:
    https://www.blackbikewheels.com/

    I priced a set of spoke wheels and was very happy with the quote they gave me.
  • Slowen down Posts: 70
    Mid North Coast NSW
    Stock Poster Slowen down
    30 Jan 2020 05:31 PM
    I will have a look at this on weekend, sounds easy enough.
    Do you know anyone who runs a 200 on the same bike?
    Cheers Steve.
  • micathia Posts: 198
    Stock Poster micathia
    07 Feb 2020 09:08 AM
    I don't have first hand exp in dyna (I am going to get my WG today), but I have first hand exp on iron 883. 

    First of all, you need this link, tyre size calculator:

    https://www.tacomaworld.com/tirecalc?tires=180-60r17-190-65r16

    If it loaded right, it will show you the some measurement gap between 180/60-17 (your stock?) and 190/65-16. 
    The gap (Circum. most important) is only 0.9%. This is pretty good!!! 
    Now try 200/60-16, the circum gap is 0.2%, even better!!!
    Now play around with number again, try 200/55-17, the circum gap is 0.6%, not bad either. 

    At this stage I am just surprised myself that you can have so many options. Because on my iron 883, my only hope is 170/70-16 to replace stock 150/80-16. I don't have other small gap option at all. :(

    The second tip:
    the specs mentioned above, some are for 16" rim, some are for 17" rim. One thing to be aware is, you can fit bigger tyre in narrow rim, but its size and look are all different. I can fit 170mm typre on the iron 883 3" rim, but its actual width is only 150+mm. Because narrow rim will squash the type. There is also a risk factor, after 4000km, the squashed tyre will show numerous small cracks on the mid-line. 

    So if you want to go wider, you almost always want a wider rim. My WG is 17x4.5 rim, you can fit 190 on it, but it won't look/measure as 190mm, because it will be squashed. A good candidate rim is 2016/17 Dyan Fatbob's black solid 16x5 rim. That's why I gave several 16" tyre specs above. 

    If you want the easiest option, theoretically, just take the rear off and install a 220/55-17 on your 17x4.5 rim. It won't look as wide as real 200, it wont measure near 200mm and it will look weird from the sides. 

    I don't know all the rim types for dyna. I only know 2016/17 fabbob's black solid (not full solid with some holes) 16x5 rim is a pretty good candidate and solid looks cool. 

    ==========
    PS: 
    1. if you don't do the swap yourself, the cost could easily exceed $1000; if you do by yourself, make sure you have handy tools to grind the spacer. or even buy more spare spacers before trying.
    2. always check the circum gap. usually if the new tyre circum is slightly bigger, it is better. It will make your speedo more accurate since dealers always made speedo reading higher than the actual speed to prevent you from speeding. higher circum will also make your trip miles reading lower. Say you are going to a 100km distance trip every day, after the wheel change, it will show slightly shorter than 100km. This will also make your service interval actually longer, since now 8000km is longer than 8000km before. 
    3. if the rear circum becomes bigger, you need also check if it becomes even bigger than the front, like 48 or softail slim lol. 
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