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No flex z is twin tube still and not replacement for mono flex which is single tube, that is mono sport. Replacements are:

Tein super street > street advance (both twin tube) still 5 / 4 on bnr32

Tein type flex > flex z (both twin tube) now 7 / 6 on bnr32

Tein mono flex > mono sport (both single/mono tube) now 10 / 8 on bnr32

All construction appears to be of a cheaper construction compared to the old lineup according to a few sources as I was going to get a set of mono sport for my Bcnr33. I think I'll go with the Ohlins mono tube after Tein has changed their lineup.

 

 

 

Why the hell is any "top shelf" damper being made in a twin tube design in this day and age?  FFS!
Because most old school JDM brands never changed design or improved development to modern standard so they got left behind in the 90's.
HKS, Tomei, Tein, Greddy, Defi etc

The part number listed is the full damper kit part number, the part number in your pick above is the damper only part number. I take it that's the rear above, check your front, it should have a different number. Fulcrum suspension being the Tein Australian supplier and service company did release Australian spec super streets also, but I believe the Aussie stuff was made softer than the Jap stuff and don't know if this was done at a spring level or a damper valving level. I would suspect at a spring level as that would be easier than revalving. Give Fulcrum a call to find out as you may in fact have Aussie spec ones. Regardless, the spring rate is probably as listed by Tein.

On ‎4‎/‎5‎/‎2019 at 9:29 AM, GTSBoy said:

Why the hell is any "top shelf" damper being made in a twin tube design in this day and age?  FFS!

Twin tube does have it's pros, cheaper construction, lower gas pressures, but mainly that you can damage the outer body and it won't affect the operation of the damper piston moving as that runs on the inner tube. This would be the main reason all oem dampers are this way as if the damper has an external impact and damages the outer body, the damper is not a throw away like a mono tube. Obviously the valving in twin tube dampers is shit because the pistons are so much smaller compared to a mono design and that changes the valving oil orifice size, and why good performance dampers aren't usually twin tube.

On ‎4‎/‎5‎/‎2019 at 2:13 PM, Leroy Peterson said:

Because most old school JDM brands never changed design or improved development to modern standard so they got left behind in the 90's.
HKS, Tomei, Tein, Greddy, Defi etc

That's not true at all. Tein, HKS, Cusco ect. have all made mono tube dampers in the 90's. Tein RA were monotube. HKS hypermax III / IV are monotube, but remember they aren't a suspension company either. Can't really compare HKS, Greddy, ect. to Tein though as they are a suspension company only like Bilstein, Ohlins, Supashock ect. and they offer a much wider range from very entry level to their upper end performance stuff (like the dear as poison $5 - $20k dampers like Super racing, HT, Group N, N1 dampers). It's a shame they have appeared to have cut production costs on their lower end stuff. That said they have just released a proper replacement for the mono flex - the mono racing which is valved like the $5k+ Super racing damper allegedly and is around $2.5 - $3.5k.

At the risk of sounding like a smart ass, there's a lot more to it than 'mono tube are better'

For example, arguably the best dampers in the world the Ohlins TTX 40 are twin tube (that's what the TT stands for)

https://www.ohlins.com/product/ttx40-mk-ii/

Having said that, they are a well researched and engineered solution from a company that expends a huge amount of time resources on a product that works. I think generally speaking for less well resourced/mass market companies a montube is simpler to execute to a higher standard and provides increased flexibility when pushing out designs across a number of platforms. 

These are quite specialised twin tube dampers, and are far from comparable to the regular twin tube out there with 20 - 30mm pistons. These have 40mm pistons which are similar to most mono tube dampers at around 40 - 45mm which is important. No doubt a good damper, hey it is Ohlins, and they are specialised suspension.

Usually mono tube is better, above is an exception.

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