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  1. #1
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    Default Need springer help

    Anybody know what size springer is on this sporty?as well as rear wheel size.cant find any other pictures of this thing or the owner but its sweet and i want specs to build mine similarClick image for larger version. 

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    Last edited by hardleyableson1996; 06-30-2019 at 9:36 PM.

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    It's not so much springer help ya want, it's more like guess the bike part...

    Rear wheel looks like the typical 5.10x16 or 130/90x16 (aka MT90x16), scale the front end from what you know...rear wheel is a 16", front looks to be a 21"...maybe a 3.00...got any tires to measure?

    Here is a tire conversion chart:
    https://www.mad-ducati.com/Technical...TireChart.html

    Using RB Racing Tire Calculator,
    a 130/90x16 tire has a height of 25.21" ,
    a 3.00 x21 (90/90x21) = 27.38"tall;
    a 3.25x21(100/90x21) = 28.09" tall.
    https://www.rbracing-rsr.com/tirediamcalc.html

    See springer length chart, from -4 to +16 on this page: http://www.thompsonchoppers.com/spri...rks-frontends/
    Click image for larger version. 

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    Last edited by TriNortchopz; 07-01-2019 at 12:50 AM. Reason: tire calculator

  3. #3

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    rear wheel is a stock 16 by the looks of it. Just seems bigger because of the whitewall tyre.
    Springer length varies depending on manufacturer. That looks like a DNA type and if i remember, they list "stock" length as a good bit over what harley traditionally list as "stock length" (20").

    My re-pop harley style springer on my ironhead looked to be pretty much the exact same length as above and gave just a little kick up at the front. It was a 4 over (24") springer.

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    Yeah that kick on the underside of the frame is what I like not too much and not too little but stock length is 24 on a sporty?

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    Quote Originally Posted by hardleyableson1996 View Post
    Yeah that kick on the underside of the frame is what I like not too much
    Are you talking about the exhaust bracket?

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    Quote Originally Posted by 53panhead View Post
    Are you talking about the exhaust bracket?
    no im talking about the stance of the frame how the 16 inch rear and the height of the springer make the frame sit a certain way

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    Quote Originally Posted by TriNortchopz View Post
    It's not so much springer help ya want, it's more like guess the bike part...

    Rear wheel looks like the typical 5.10x16 or 130/90x16 (aka MT90x16), scale the front end from what you know...rear wheel is a 16", front looks to be a 21"...maybe a 3.00...got any tires to measure?

    Here is a tire conversion chart:
    https://www.mad-ducati.com/Technical...TireChart.html

    Using RB Racing Tire Calculator,
    a 130/90x16 tire has a height of 25.21" ,
    a 3.00 x21 (90/90x21) = 27.38"tall;
    a 3.25x21(100/90x21) = 28.09" tall.
    https://www.rbracing-rsr.com/tirediamcalc.html

    See springer length chart, from -4 to +16 on this page: http://www.thompsonchoppers.com/spri...rks-frontends/
    Click image for larger version. 

Name:	Springer length_chart1.jpg 
Views:	1 
Size:	17.5 KB 
ID:	95312
    Alright lets say knowing it has a mt90/16 rear, with 10.5 inch slammed shocks in the rear and a 90/90-21 in the front what would you take away from this as the length of the springer? my friend thinks its stock or 2 over max

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    Quote Originally Posted by hardleyableson1996 View Post
    no im talking about the stance of the frame how the 16 inch rear and the height of the springer make the frame sit a certain way
    I understand now you like it to sit about flat with a little rake me too.

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    Quote Originally Posted by TriNortchopz View Post
    It's not so much springer help ya want, it's more like guess the bike part...

    Rear wheel looks like the typical 5.10x16 or 130/90x16 (aka MT90x16), scale the front end from what you know...rear wheel is a 16", front looks to be a 21"...maybe a 3.00...got any tires to measure?

    Here is a tire conversion chart:
    https://www.mad-ducati.com/Technical...TireChart.html

    Using RB Racing Tire Calculator,
    a 130/90x16 tire has a height of 25.21" ,
    a 3.00 x21 (90/90x21) = 27.38"tall;
    a 3.25x21(100/90x21) = 28.09" tall.
    https://www.rbracing-rsr.com/tirediamcalc.html

    See springer length chart, from -4 to +16 on this page: http://www.thompsonchoppers.com/spri...rks-frontends/
    Click image for larger version. 

Name:	Springer length_chart1.jpg 
Views:	1 
Size:	17.5 KB 
ID:	95312
    Alright lets say knowing it has a mt90/16 rear, with 10.5 inch slammed shocks in the rear and a 90/90-21 in the front what would you take away from this as the length of the springer? my friend thinks its stock or 2 over max

  10. #10

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    So old harley springers for knucks / flattys etc considered 'stock' length to be 20" so if you buy a vintage harley replica in stock length this is what you are getting. DNA and some others actually have 22" as their "stock offering" which would actually be +2"over compared to a harley springer. My ironhead ran a hardtailed 79' frame with stock rake / neck and an 18" rear with 21" front, 4" over harley springer.
    If you are running shocks on a stock frame, the back end may still sit a little higher than a rigid, even so, with a 16" rear tyre im still gonna say what you want is a 24" length springer to achieve that slightly jacked up stance. Too much looks stupid on a sporty as they are too short in the back.

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    Quote Originally Posted by Sugarcubes View Post
    So old harley springers for knucks / flattys etc considered 'stock' length to be 20" so if you buy a vintage harley replica in stock length this is what you are getting. DNA and some others actually have 22" as their "stock offering" which would actually be +2"over compared to a harley springer. My ironhead ran a hardtailed 79' frame with stock rake / neck and an 18" rear with 21" front, 4" over harley springer.
    If you are running shocks on a stock frame, the back end may still sit a little higher than a rigid, even so, with a 16" rear tyre im still gonna say what you want is a 24" length springer to achieve that slightly jacked up stance. Too much looks stupid on a sporty as they are too short in the back.
    Thank you that's the exact info I was looking for man!

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