Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)

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Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
Price: $72.99
Discontinued Online
This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.

This is a pack of two optional Pro-Line 12mm Big Bore Pro-Spec Front Shocks, designed for Short Course Trucks and other 1/10 scale off-road applications. The next generation of Pro-Line Shock Technology has arrived - The Pro-Line Pro-Spec Shocks! These shocks come nearly ready-to-go; just add the shock fluid of your choosing and hit the track.

The Pro-Spec Shocks are a 12mm Big Bore design with a Single Low Friction X-Ring Seal. The Pistons and Shaft Guides are made from Silky Smooth White Delrin for Low Stiction and the 3.5mm thick Shock Shaft is Hard Chrome Coated, just like full scale racing shocks. Also featured on the Pro-Spec Shocks are easy access Bleeder Cap Screws that allow for consistent shock bleeds and builds every time.

Each pair of Pro-Spec Shocks includes 3 different piston options (1.4, 1.6 & 1.8) and a blank piston for drilling to a custom size. Custom Shock Tightening Tools and optional shock limiters are also included. Optional Pro-Spec Springs are available separately. Upper and lower shock pivot balls are included so you can fit a wider range of vehicles right out of the box.


  • Smoothest Shocks Pro-Line has ever made
  • Pre-Assembled, Just Fill and Go
  • 12mm Big Bore Technology
  • Single Low Friction X-Ring Seal
  • Silky Smooth White Delrin Shaft Guides and Pistons
  • Optional Pistons and Limiters Included
  • Easy Access Bleeder Cap Screw
  • Hard Chrome Coated 3.5mm Shock Shaft
  • Optional Spring Rates available separately
  • Will work with Hardware kit (PRO6063-05)
  • Also available in a kit form (PRO6308-00)
  • Pro-Spec (PRO6308-31) Rear Shocks also available


  • Pro-Spec Front Shock Lengths (No Limiters):
    • Extended: 88mm
    • Collapsed: 62.5mm

    ProLine Shock Data


  • PRO6308-02: Pro-Spec Delrin Piston & Guide Tree
  • PRO6308-03: Pro-Spec Plastic Tree
  • PRO6308-04: Pro-Spec Shock O-Rings
  • PRO6308-05: Pro-Spec Shock Hardware
  • PRO6308-06: Pro-Spec Shock Cartridges
  • PRO6308-07: Pro-Spec Front Shock Shafts
  • PRO6308-09: Pro-Spec Front Shock Bodies
  • PRO6308-13: Pro-Spec Front Yellow (Medium) Springs

This product was added to our catalog on April 10, 2014

Verified Owner
Friday, Apr 24 2020 (about 2 years ago)
Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
These shocks went on the front of my losi DB pro since the stock fronts leaked like an old faucet.
I'm a machinist by trade and I can tell quality machining when I see it.
Very nice shocks.
Comes with extra pistons and shock eyes.
Add your flavor of oil and go.
The price is steep though.
Supplied springs were a bit on the light side for my buggy.
Ended up with 45wt lisi oil and stock springs on these
Verified Owner
Friday, Aug 23 2019 (about 3 years ago)
Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
Incredible shock absorbers, I have them mounted in the front of my scx10 ii, in the rear I have those of 110, they work very well and do not lose oil
Verified Owner
Wednesday, Oct 31 2018 (about 4 years ago)
Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
Just got into dirt oval racing this year, took my old slash and ran half the season on these shocks that have been bashed around for the last two years without checking or rebuilding the shocks. After I rebuilt them at the halfway point found they still had nearly full fluid in them. Best shocks by far, worth every penny. At first glance they may seem overpriced, but let me assure you they are perfectly priced for what you get and what I'm still getting out of them.
Verified Owner
Tuesday, Aug 16 2022 (7 months ago)
Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
Top cap is plastic and bleeder screw was stripped. Pro line won't sell me a cap. Said I need to buy new shock. 80$ should be metal cap. Came stripped from pro line.
Verified Owner
Saturday, Dec 10 2016 (about 6 years ago)
Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
I love these shocks on my sc10 what a improvement from the older factory team shocks(not 12mm) and just add oil and go . i used 30w all around as a base and right off the bat a huge improvement . 5 stars
Verified Owner
Friday, Jan 30 2015 (about 8 years ago)
Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
Really good product. The only thing I did not like is I had to put in a bigger screw to keep them from hitting the shock tower on my SC10. If it were not for that I would have given this a 5 star rating.
Thursday, Mar 24 2022 (12 months ago)
Pro-Line 12mm Big Bore Pro-Spec Front Shock (2) (Pre-Assembled)
I think pro-line needs to review how they sleep at night !!They should be ashamed of theirself for what they are asking for these parts ! I don't mind paying up for quality stuff,but come on !!!!