Springs... 2.5" 2.25" whats the difference

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Springs... 2.5" 2.25" whats the difference

Post by JoeySully » Thu May 23, 2019 11:51 am

Hi all

I seem to have one saggy front spring on my se6a and need to replace both.

I have relatively new Spax on standard springs. what is my best option for replacements ?

I think the spax from GW take 2.25 and 2.5"?

what difference does it make to use one over the other ?

why do some use helper springs ?

300lbs seems to be the going spring rate based on my searches, although most threads talk about se5.
Is 300lbs good for se6a too? I prefer a soft suspension to take up all the bumps from the rough roads.



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Springs... 2.5" 2.25" whats the difference

Post by peter freeman » Thu May 23, 2019 1:13 pm

The original springs were never much good and did not last long which is why uprated springs are better and adjustable shockers to adjust the ride softness/hardness.



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Springs... 2.5" 2.25" whats the difference

Post by Roger Pennington » Thu May 23, 2019 1:29 pm

JoeySully wrote:
Thu May 23, 2019 11:51 am
I think the spax from GW take 2.25 and 2.5"?
Unless you were supplied with two sets of spring mounts ("collets") then they will only take one or the other - whichever your mounts are?

Standard were 2.5". The main advantages of 2.25" are that they are more widely used in, e.g. motorsport, so there's a bigger range of aftermarket springs available. Also, as they are a bit slimmer, they give a bit more clearance around the unit. But, you'll need the appropriate collets to use them.
JoeySully wrote:
Thu May 23, 2019 11:51 am
why do some use helper springs ?
There are several reasons, one common one is that if people use a very short spring, it becomes loose and rattles around on full droop, so a weak helper spring can fill the gap.


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Springs... 2.5" 2.25" whats the difference

Post by JoeySully » Thu May 23, 2019 1:51 pm

Thanks for the replies. I believe the ones i have are uprated. But probably 12 years old now.

I will have to get them off and check which collets are fitted. The 2.5 spring will fit over 2.25 i guess. Im pretty sure i asked for standard ones. Would it be very obvious if a 2.5 was fitted to 2.25 collet?

So between the two sizes there are no noticeable performance differences for a standard roadgoing car.



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Springs... 2.5" 2.25" whats the difference

Post by Roger Pennington » Thu May 23, 2019 2:48 pm

JoeySully wrote:
Thu May 23, 2019 1:51 pm
The 2.5 spring will fit over 2.25 i guess. Im pretty sure i asked for standard ones. Would it be very obvious if a 2.5 was fitted to 2.25 collet?
It will, but it would be a sloppy fit at best, maybe even dangerous. Assuming you've got ride-height adjustable dampers, they look something like this:

Damper.jpg
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(image from the web)

I've highlit the collets, and the arrows point to their inner flange which is intended to be a snug fit in the spring - if the springs were oversize they would slop about on there. If your dampers don't have adjustable seats, you may not be able to change the collets, so you'll have to use 2.5"


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Springs... 2.5" 2.25" whats the difference

Post by JoeySully » Thu May 23, 2019 2:54 pm

i do have adjustable seats but I'm unsure if they are 2.5" or 2.25". i will whip them off next week and double check before ordering new springs.
For normal road use what spring length do folk use ?



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Springs... 2.5" 2.25" whats the difference

Post by CNHSS1 » Thu May 23, 2019 3:12 pm

Reliant seemed to have a knack of buying the most dreadful quality springs! All small sports suffer from poor quality springs, soft and soggy, often see ss1s almost on their front bumpstops :cry:

Almost all aftermarket springs will be better quality

ID sizing is 1.9" & 2.25" are industry standard universal sizes, the smaller 1.9s are often spaced for clearance and packaging reasons (not an issue with big scims).


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Springs... 2.5" 2.25" whats the difference

Post by Dennis Nicholas » Thu May 23, 2019 4:20 pm

When I did my 6a springs and dampers I used PROTECH dampers. The springs were 250 lb in. front and 225 lb in rear. Both were 2 1/4 inch dia. the front at first was 10 inch but found to go coil bound and was changed to 13.5 inch BUT really would have been better with 14 inch as occasional bumps on bad road (hitting damper bump stops?). the 13.5 inch springs left 3 1/8 of thread from bottom of bottom collet to bottom of thread so plenty of room for the 14 inch spring. Height set with wishbones parallel to ground. The adjustable damping was set to my liking of comfortable....not too harsh and not too sloppy. So used 13.5" X 13 coils of 11.6mm wire 250 lb in. This was found to give a coil-bound length of 5.937" so 13.5 -5.937 gives 7.563" of free movement. Weight of car on spring gave 4.83" compression so 7.563 - 4.83 gives 2.733" further compression before coil-bound....thus the extra .5" of spring length could just make all the difference.
I think I did a piece somewhere about how to measure the comfort factor involving a curved graph of very sloppy to very harsh and a few easy simple measurement you can take to show where you are on the graph.

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Springs... 2.5" 2.25" whats the difference

Post by JoeySully » Fri May 24, 2019 9:51 am

Thanks Denis. Very useful info. I will have to renew my membership to search the archives for that. Looks like 14" will be best.

I will take one off and check the collet size first.



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Springs... 2.5" 2.25" whats the difference

Post by JoeySully » Sun May 26, 2019 1:34 pm

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So i have one 2.25" at the top and one 2.5" at the bottom. I guess a 2.4" would fit perfectly :roll:

These were bought from GW but bith returned to Spax to rebuild after one leaked for refurb. I guess they fitted the wrong collets when rebuilding.

I will have to see if the will send me out some 2.25" bottom collets.
Current springs messure 13.5"



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Springs... 2.5" 2.25" whats the difference

Post by reliant-reviver » Mon May 27, 2019 1:48 pm

Not sure if it's of any help but I have a pair of unused 14" x 2.5" 250lb springs for sale. On eBay ATM here https://rover.ebay.com/rover/0/0/0?mpre ... 3850579473

Happy to do a better price on them off eBay in saving some fees.


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Springs... 2.5" 2.25" whats the difference

Post by JoeySully » Mon May 27, 2019 2:47 pm

Of course today is bank holiday in UK so Spax are closed and was not able to get in contact with them.

Those are exactly the ones i'm looking for although I was hoping to go for 2.25 as they seem to be cheaper.. but not as cheap as yours ;)

I cant seem to find anywhere online to purchase spring collets for Spax shock.

Let me check with them tomorrow and get back to you. I need to see what the cost is going to be for upper or lower collets.



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Springs... 2.5" 2.25" whats the difference

Post by Steve_S » Mon May 27, 2019 3:40 pm

reliant-reviver wrote:
Mon May 27, 2019 1:48 pm
Not sure if it's of any help but I have a pair of unused 14" x 2.5" 250lb springs for sale. On eBay ATM here https://rover.ebay.com/rover/0/0/0?mpre ... 3850579473

Happy to do a better price on them off eBay in saving some fees.
Not wanting to jump in front of Joeysully but I would like the springs please if he doesn't want them



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Springs... 2.5" 2.25" whats the difference

Post by JoeySully » Mon May 27, 2019 4:48 pm

That's not just jumping ahead but blatant thread hijacking too :shock:

I will decide tomorrow but I guess if they are gone off Evil bay then I will know who bought them ! :lol:



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Springs... 2.5" 2.25" whats the difference

Post by reliant-reviver » Mon May 27, 2019 5:53 pm

Some bloke with Nova in his user name bought them last week before asking "are they for a lowered ride height?" And then requesting a cancellation.

I think in fairness I shall jack the price up while they remain on eBay for now which should deter any immediate purchasers.
You may then decide in order if either of you would like them and we can go from there.
They've been on my shelf for a decade!

I don't know if Tony Shakeshaft is still a director (?) At Spax but he was a former GTE owner and very helpful. For comparison I bought new collets from AVO for 7 quid each.


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