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#1 Chamse

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Posted 27 August 2017 - 10:25 AM

Hey guys

 

I am thinking about upgrading my old rusty wheels with some new wheels.

 

Can anyone tell me if these would fit my 1976 datsun 620?

 

https://www.summitra...68200/overview/

 

Thanks! 



#2 datzenmike

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Posted 27 August 2017 - 11:05 AM

Well you need to know where you are, to know where you're going. Take you rim off and place a straight edge across the back of the rim and measure down to the wheel mounting surface (WMS) You don't have your profile completed. What year is your 620??? Before '74 the rim widths were 4" and after they are 4.5" wide.

 

If for example, the wheel mounting surface is 2.25 inches down and you have a '74 or newer, then your offset is zero and the WMS is in the center of the rim. If you go to an 8" rim there will be 1 3/4" extra on either side compared to the stock rim. If you get 8" rims with -2" offset your rim will end up 3 3/4" outward and fender clearance may be a problem. +2" offset may be in to far and hit the frame or suspension on turns. I'm using inches but offset is usually in millimeters (mm) Always know what will fit and what won't before buying. Rims should be selected to fit the truck, not the truck made to fit the rims. (see retarded below)

 

 

 

Setback or offset is more important. If too much negative offset the wheel and tire will sit outside the fender. This will result in the fender hitting the tire and gouging a groove all the way round or chewing up the sidewall as it turns. In addition dirt and road debris is thrown onto the body and it looks retarded because... it is retarded.

 

 

The 620 comes with 14" tires and rims. Most times you can go an inch taller without throwing the 620's esthetics off too much. When you get to 17" it doesn't look right in a fender opening designed for a 14" tire with more rubber showing. But hey, 14" are hard to find today and it's your truck. Over $200 US for a rim? Then tires? They'll be worth more than the truck!!!


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#3 Stoffregen Motorsports

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Posted 27 August 2017 - 11:11 AM

I wonder what the guys running Titan wheels do for fitment. I know they do fit, but are they running wheels spacers or making other mods?

 

And those Titan wheels are huge. Fitting a 17" wheel shouldn't be too much work, but yes, as Mike said, get some measurements off your existing setup. Measure how much clearance you have with a wheel and tire mounted and use that info to help chose a new wheel/tire package.



#4 flatcat19

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Posted 27 August 2017 - 12:23 PM

So much positive offset. Like said above, research what it takes to fit Titan wheels.


Zero/low positive offset wheels will make fitment easier.

You can't hang if your nuts haven't dropped...it's physics


#5 thisismatt

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Posted 27 August 2017 - 12:33 PM

So much positive offset. Like said above, research what it takes to fit Titan wheels.


Zero/low positive offset wheels will make fitment easier.

The wheels linked are zero offset...
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#6 Stoffregen Motorsports

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Posted 27 August 2017 - 01:01 PM

I saw that, but even though they are zero offset, they still have about 2 inches more backspace than the original wheels.



#7 datzenmike

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Posted 27 August 2017 - 01:11 PM

Also says backspacing 4.5" so... wtf?

 

Another thing is to see if the hole in the center is large enough to slip over the 620 hub. As these take a conical seat lug nut, doesn't the hole in the rim center on the hub diameter???

 

Stock tires are 6:00 x 14" or roughly 175/70R14 which are 23.65" tall and the sidewall is 4.8 tall. You don't want Donk Wagon Wheels so if running 17" and expect to get away with  an 8"tire you want it to also be around 23.65" tall so your speedometer, acceleration and over all gearing is not affected. The equivalent of a 175/70r14 in 17" rim would be...

 

250/40R17 @ 23.77 and 8.5" wide

210/40R17 @ 23.61 and 8.25" wide

204/40R17 @ 23.5 and 8" wide

195/45R17 @ 23.91 and 7.7" wide and side wall height 3.3" that's 1.5" less rubber and more rim on a 620.


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#8 thisismatt

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Posted 27 August 2017 - 01:15 PM

Also says backspacing 4.5" so... wtf?

 

because 8" rim has 1" of lip, or 1/2" per side = 4.5" backspace


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#9 Stoffregen Motorsports

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Posted 27 August 2017 - 01:17 PM

Also says backspacing 4.5" so... wtf?

Backspacing and offset aren't just different names for the same thing. Offset measures the offset from centerline. Backspacing includes the outside of the wheel lip, so on a cast aluminum wheel with a thick outer lip, an 8" wheel with zero offset wouldn't have 4" of backspace. It would have 4" of backspace + the thickness of the lip.



#10 flatcat19

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Posted 27 August 2017 - 01:33 PM

$856 worth of rims. Add in cost of machining the hubs, cost of longer wheel studs, lug nuts...and now 17" tires too.



And...AND...all of this weight is still on drum brakes.

But hey, if you think it's cool.



I'd be beyond happy with a set of 16" slots with good tires...and pocket the $400 saved.

When I put the K5s on my truck I could feel the difference big time. I would not add that much weight again.

You can't hang if your nuts haven't dropped...it's physics


#11 thisismatt

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Posted 27 August 2017 - 01:44 PM

4.183 in. center bore isn't big enough for 620 hub?


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#12 datzenmike

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Posted 27 August 2017 - 01:47 PM

I don't know, but conical nuts aren't for centering the rim or bearing the weight of the vehicle. The rim is centered by a snug fit over the spindle.


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#13 thisismatt

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Posted 27 August 2017 - 01:59 PM

I don't know, but conical nuts aren't for centering the rim or bearing the weight of the vehicle. The rim is centered by a snug fit over the spindle.

 

Tell that to every stock 521 and 620 with drum brakes...


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#14 flatcat19

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Posted 27 August 2017 - 04:24 PM

I think Matt is trying to sell himself on those wheels as well.

You can't hang if your nuts haven't dropped...it's physics


#15 thisismatt

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Posted 27 August 2017 - 04:28 PM

I think Matt is trying to sell himself on those wheels as well.

naw, got nismo Ray's...
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#16 flatcat19

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Posted 27 August 2017 - 04:56 PM

Those are just as hideous on an old truck.

You can't hang if your nuts haven't dropped...it's physics


#17 thisismatt

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Posted 27 August 2017 - 05:11 PM

Those are just as hideous on an old truck.

So is your mom
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#18 flatcat19

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Posted 27 August 2017 - 05:16 PM

She looked way better bent over the front on a new diesel F350.

Good call.

You can't hang if your nuts haven't dropped...it's physics


#19 thisismatt

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Posted 27 August 2017 - 05:17 PM

Is that a powerjoke?
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#20 Chamse

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Posted 28 August 2017 - 01:02 AM

Thanks for the help guys. ill do some measuring before ordering :)