Billet coaxial shock mounts
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
We recently redesigned the billet coaxial mounts for our Xidas. Along with reducing the price a bunch, we added adapters to be able to run these with just about any 10 or 12mm pin Miata shock.
Before asking if they'll fit yours, the answer is yes if they:
Optional 2.5" and 70mm (Tein) spring perches
Optional 10mm shaft adapters. Reuse whatever top nut you have now.
![](http://949racing.com/images/products/display/SuperMiata_billet_shock_mount.jpg?)
![](http://949racing.com/images/BMT_Spring_Perches.jpg?)
Before asking if they'll fit yours, the answer is yes if they:
- Have 10 or 12mm pins
- Use 2.25", 2.5" or 70mm springs
Optional 2.5" and 70mm (Tein) spring perches
Optional 10mm shaft adapters. Reuse whatever top nut you have now.
![](http://949racing.com/images/products/display/SuperMiata_billet_shock_mount.jpg?)
![](http://949racing.com/images/BMT_Spring_Perches.jpg?)
![](http://949racing.com/images/products/display/supermiata_BMT_coaxial_perch.jpg?)
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#3
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
An example of our BCM's (Billet Coaxial Mounts) on a set of Tein Flex.
10mm shaft adapters and 70mm spring perch options..voila!
Same can be done for Bilsteins, Koni's, MCS, Penske you name it. Just measure your shock shaft diameter and know what spring diameters your sleeves are.
Despite the overall size difference, the installed height is exactly the same. The spring sits lower on the coilover but the ride height remains unchanged. No change to bump travel, but all the stiction and binding of the fix perch eliminated.
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xap1/v/t1.0-9/12341109_10104803384336093_8735979715754840027_n.jpg?oh=3d8dc73199bec0e1675ef8be3a716ca1&oe=56E8F793)
Demonstrating the range of motion with the coaxial or "floating" spring perch.
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/12313846_10104803384385993_3771855530255062339_n.jpg?oh=7c102271dfbe29793d73ffd4e41e05f8&oe=571F208B)
In situ
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/12314104_10104803384590583_769053044840030795_n.jpg?oh=18a93c4bdca1cc3ccd642e4b57fb5d9c&oe=56ED4304)
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xtf1/v/t1.0-9/12313835_10104803384535693_6060156030609820469_n.jpg?oh=3ba7f17c5791ae914508dbb2cbebd509&oe=56F27954)
Not Xidas but this car stayed in a Holiday Inn Express parking lot last night. Getting an EDFC on there might require a thinner top nut. The bigger bearing and thicker mount uses up most of the threads.
10mm shaft adapters and 70mm spring perch options..voila!
Same can be done for Bilsteins, Koni's, MCS, Penske you name it. Just measure your shock shaft diameter and know what spring diameters your sleeves are.
Despite the overall size difference, the installed height is exactly the same. The spring sits lower on the coilover but the ride height remains unchanged. No change to bump travel, but all the stiction and binding of the fix perch eliminated.
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xap1/v/t1.0-9/12341109_10104803384336093_8735979715754840027_n.jpg?oh=3d8dc73199bec0e1675ef8be3a716ca1&oe=56E8F793)
Demonstrating the range of motion with the coaxial or "floating" spring perch.
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/12313846_10104803384385993_3771855530255062339_n.jpg?oh=7c102271dfbe29793d73ffd4e41e05f8&oe=571F208B)
In situ
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/12314104_10104803384590583_769053044840030795_n.jpg?oh=18a93c4bdca1cc3ccd642e4b57fb5d9c&oe=56ED4304)
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xtf1/v/t1.0-9/12313835_10104803384535693_6060156030609820469_n.jpg?oh=3ba7f17c5791ae914508dbb2cbebd509&oe=56F27954)
Not Xidas but this car stayed in a Holiday Inn Express parking lot last night. Getting an EDFC on there might require a thinner top nut. The bigger bearing and thicker mount uses up most of the threads.
![](https://scontent-sjc2-1.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/12274226_10104803384485793_4718221915917100412_n.jpg?oh=3663f32db5d683fe00e1ed054866dd74&oe=56E6EF21)
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#5
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
The plane of the body changes relative angle to the lower mount as the control arm swings through it's travel. This is a separate but just as important deflection acting on the springs that a fixed mount does not address, coaxial mounts do.
Two birds, one stone. Letting the damper do it's job with fewer extraneous loads and binding forces imposed.
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