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    Sur-Ron Modifications, adjustments, tips & tricks

    Modifications, adjustments, tips & tricks


    Here is the list of the available modifications, tips & trick:
    Last edited by Rodney64; 06-25-2018, 10:28 PM.

    #2
    Sur-Ron headset

    Luna now offers a high end replacement headset kit from Cane Creek, it comes with a PVC pipe to make the installation a breeze.


    Click here to see the listing

    Click image for larger version  Name:	surron_cane_creek_headset__01916.1537046626  .jpg Views:	1 Size:	64.0 KB ID:	74778


    See below for what makes up the Surron headset. With this info you can service headset, replace components and potentially switch to a different fork if you wanted to.

    The part numbers are for a HOPE headset and will work fine with the Sur-Ron.

    Click image for larger versionName:	head set.pngViews:	1Size:	222.2 KBID:	71588


    For the removal & installation, please watch this video

    Comment


      #3
      Tire and tube replacement.

      How to fix a flat?


      This is not a standard mountain bike so you will not be able to use your little plastic levers, you will need real MX style metal tires levers (also called tires spoon).

      Something like this is probably sufficient for the stock tires

      You will also need a MX tube to replace it, The stock one is on the thin side and if weight is not an issue for you you can opt for a heavy-duty thick tube (lie a Kenda Tuff tube or else). The size you will need is a TR-4 700/100-19 good for 2.5" to 2.75".



      Change your tire?

      The size is the same as the front and they are 70/100-19 tires. You may try to use a larger tire but you may have to shave some block or dish the wheel a little. There is simply not much space to work with.

      So far we've seen a few members or the Sur-ron Owners group on Facebook that changed the tires to something better and wider, here is the list:
      Bridgestone M-403 (direct fit)
      Shinko SR241 Series Trials Tire 3.50x19 (will probably rub so be prepared to align your wheel, remove the kickstand or shave the knobs)
      Pirelli Scorpion mx mid soft 32 70/100-19 (direct fit)

      Comment


        #4
        RST replacemendt axle and axle nut?

        If your local bike shop can't order you a new axle from the RST distributor you can order them online, they seem to be harder to get in the USA. we found you this place that has them in stock if you are in need.

        Complete axle with the locking nut

        Alternative to the first link

        Just the locking nut

        Comment


          #5
          Upgrading/replacing Sur-Ron brake pads and disks


          The Sur-Ron uses 4 piston downhill type hydraulics brakes and 203mm disks.

          The caliper uses Shimano replacement pads, look for a pad for :Saint M810, Saint M820 or ZEE M640.. You can even use aftermarket pads like Kool Stop, you can also change the compound to metallic and such. This is an example of a compatible replacement.

          If you want to upgrade the complete braking system you can too, Shimano Zee or Saints, Magura MT5/MT7 or even Hopes. Just remember that the front brake is the right lever as most MTB brakes are the opposite,


          For the disks, the front uses MTB standard 6 bolt rotors so you can use any disk you like, you can go with a Shimano Icetech rotor or go with a floating rotor too. IF you plan on going over 203mm you will need a new caliper mount. But the rear has a different bolt pattern and standard mountain bike disk will not fit. You will need to use rear Sur-Ron disks.

          Comment


            #6

            Sur-Ron replacement connectors:

            Charger connector

            You would like to use your charger (at your own risks), the charger connector is a NLINKO LP-20C03PE-01-001

            You can purchase them at NLINKO through Amazon.


            Discharge connector

            They are RCproplus dc-6.

            https://www.amainhobbies.com/rcpropl...rod6p8/p298526

            Comment


              #7
              Sur-Ron Low Power Mod

              This is a (very) low power mod. If at all possible probably better to use the Eco button instead. This will limit both power AND speed. In theory you could put a switch here but the idea is you simply cut the looped green/black wire.
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              Comment


                #8
                Ebrakes: More Detail

                The ebrakes are a sensor that is installed by the brake lever via a screwset.

                When installing it is VERY easy to rip out the ebrakes, which is the cause of most 'DOA' issues or intermittent working issues. Try fully unplugging to troubleshoot.

                Below shows the sensor itself where it plugs into the lever, and the other side of it where it plugs into the white connector on the bike.
                The hex bolt that the sensor enters sets the depth, and the set screw keeps it fixed in position.

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                Here we can see a closeup of how the sensor actually goes through the bolt.

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                Side angle and a view of one of the sensors fully removed.

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                How to unplug the brake cut off sensor connector

                Open battery lid slide the breaker across to OFF and remove the battery.

                Remove the 2 screws that hold in the ignition and usb.

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                Gently remove ignition to access the wiring harness for the brake cut offs.
                Trace the wires from the front and rear brakes. These are the 2 wires marked with red arrows. Unplug them.

                Click image for larger version  Name:	4.JPEG Views:	1 Size:	100.9 KB ID:	67943

                Gently remove the required brake cut off wiring and you are done.
                (Black arrow is pointing to the head light plug)

                Comment


                  #9


                  Upgrading to riser bars

                  Default stem clamp will hold 31.8mm bars
                  If you need a riser handlebar we found that one online, so far a couple customers bought it and seemed happy with it. CLICK HERE
                  To use a different diameter bar you would need to change the stem or use shims.

                  Click image for larger version

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                    #10
                    Replacing the throttle

                    The stock throttle is a cable throttle like any little dirt bike or pit bike, it is compatible with Honda CF50 throttle and etc...

                    If you do not wish to use the stock Sur-Ron throttle, you can get one for cheap from Ebay or else (See link for an example)

                    To remove it
                    1. You will need to pull out the grip or cut it off from the tube.
                    2. Turn the cable adjuster clockwise all the way in.
                    3. Unscrew the 3 bolts holding the throttle, remove the tube and cable guide
                    4. fully remove the cable adjuster from the the throttle body.
                    5. Install the new throttle
                    6. adjust the throttle properly.
                    7. Install a new grip or the old one
                    8. If the new grip is loose you can use rubber glue and safety wire to lock it in place (see pic below)

                    Once done it should look like this:

                    Click image for larger version

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                      #11
                      Replacing/locking the grips

                      Stock grips are 7/8 inch grips (or 22.2mm) from the factory. Mine were already slipping after a wet ride so I had to do something.

                      Our friend Mark K told me about using safety wire to make sure they don't come out so I can say now that I tried it, Iwill never ride without them.

                      Here is a great video on how to replace your grips and how to lock them in place.




                      Oh and while you are at it get some grip donuts and say bye bye to thumb blister

                      Click image for larger version  Name:	image.jpg Views:	1 Size:	80.8 KB ID:	75006

                      Comment


                        #12
                        Adjusting the front fork

                        The Sur-Ron uses a basic downhill mountain biking type of fork

                        One of the fork leg has the spring (can be a real metal coil or can be an air spring) Depending on the model: FastAce, RST Killah, DNM USD-8S.

                        If your fork is a an Air type you will have to buy a fork pump to add some air to it for you weight and to get proper sag, search on Youtube for setup sag on a air fork. If it's a spring type you will either have to deal with the stock spring rate or try to find a springs from another fork manufacturer (like Fox, Manitou and etc). Spring or Air both have their own pro and cons but both are effective!

                        The other fork leg is the damper, on any basic fork you will find a compression adjuster and a rebound adjuster.

                        Compression (Low speed): regulates the force that moves a fork or shock through its travel. Compression damping is achieved with fluid, usually oil. This oil circulates through a compression circuit, and by restricting its flow, the suspension can be made firmer and can even be almost locked out.

                        So basically the more you turn the knob the harder it will be to compress the fork. Ultimately you can use the compression knob to firm up the spring (ie: to prevent bottom out) You can dial it down when you need a super plush ride for comfort.

                        Rebound: Rebound damping regulates the speed at which your fork or shock recovers, or bounces back, from an impact and returns to its full travel.

                        So rebound is the opposite of the compression, Too slow and the fork wont have time to recover for the next hit and will start to pack up and eventually you will have no more travel :) Too fast and the fork will bounce you back and you will loose traction.

                        What is my ideal setting? well you will have to find out yourself, rider weight, speed, riding style and the terrain will all play a role. It’s important to remember that suspension is intended to maximize traction; it does this by keeping your rubber in contact with the ground.

                        Some say start in the middle or the adjustments while others will tell you to start from 0, either ways are good just need to take the time to setup your fork properly.

                        Comment


                          #13
                          Need to make a key copy?

                          Click on the pic to enlarge.

                          Ilco X121 DC3


                          Click image for larger version

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                            #14
                            Setting up the rear shock

                            The shock (either the DNM or the Fastace) like the front fork has a rebound adjustment and a compression adjustment. these work the same way as the front fork and need proper setup, please read the fork setup guide.

                            What differs from the fork is the spring pre-load adjustment and this is what we will cover here:


                            Your Sur-Ron light bee is probably set at the loosest setting possible so it's important to check the rear spring.

                            By this I don't mean to say to tighten down the spring a lot, too much pre-load will make the ride harsh and will require too much force to move the shock. If you are too heavy for the spring (just by sitting on it you get over 35% sag) or that you jumps cliffs for a living and bottom out on the stock spring then best would be to change the spring rate to get the proper sag and proper pre-load.

                            Lift the rear wheel up and sit the bike on a stool or a box. Grab the spring if you can move it or if you can turn the lock nut over the spring with your bare hand then it's too loose, But If you can rotate the spring and not the lock ring with your hand it's likely OK.


                            If you only need to tighten the lock-ring 1/2 turn or a full turn you can do the caveman technique and use a big flat-head screwdriver and hammer, be gentle you don't want to dent the lock ring. I personally used this technique as I only needed about 3/4 of a turn. Proper sag should be around 20% of the full travel, I weight about 170lbs with gear and I get good enough sag without much pre-load.



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                            If you need to apply more than just a turn then maybe it's best to remove the rear shock and use a locking ring spanner wrench.

                            Click on the pic to enlarge.

                            Click image for larger version

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                            Thanks Jonathan B for detailed instructions.

                            Comment


                              #15
                              Picking the right front fender for your Sur-ron

                              The surRon comes with the RST fork or the DNM/fastace inverted forks.

                              For the RST you can use any mountain bike fender you like, under the cross brace or under the front crown

                              But if you go for a "under the front crown type" you will need to check if that the cross brace clears the fender when it's fully compressed or you will break it right away,

                              Picture below is a Topeak Defender FX fender kit, it clears the cross brace fine and installs in minutes.

                              Click image for larger version

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                              If you dont like that style you can go for the "under the cross brace type"

                              like this one from Mark K, he used a
                              Mudhugger Long Front Fender

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                              If you have the inverted type you cannot use a over the tire fender because you don't have a cross -brace, so you will need a fender that is fixed under the lower crown like the Topeak shown. Since you don't have to worry about the cross brace hitting the fender you can use any mini-motocross fender you like but you will likely have to fabricate a mounting plate.

                              Picture is a Topeak defender on the RST fork, but can be fitted on the inverted forks.


                              Click image for larger version

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