The distance between the frame, where I wanted to put the shock mount, and the rear end axle tubes was such I could only use Pete and Jake "shorties." There is no air valve that you can increase or decrease air pressure into, instead there is a preload collar that you thread up and down the damper body to compress or release tension on the external spring, which affects the amount of sag. However the opposite shock mount may require a traditional mounting hardware assembly, or it may be a 15mm open end eye. The distance between the frame, where I wanted to put the shock mount, and the rear end axle tubes was such I could only use Pete and Jake "shorties." It also removes stress risers. I soon found I was banging my head on the wrong wall anyway because, when I put the shocks in place it turns out the cover would have hit the rear cross member big time. This helps to make a clean recording, but an (additional) external shock mount is much more effective. Industry standard shock mounting eyelet diameter is 15mm. Be aware that the threading comes in certain sizes, with ⅜” and ⅝” being the most common. For example, if you have a 250 lb rider that is on a spring rate that was intended for a 150- 175 lb rider, there simply is not enough preload adjustment available to be able to get close to an appropriate sag setting. Coil springs are limited to the amount of support or range they have. I wasn't about to butcher up the little "tunnels" I had made through the fender wells for any reason. A choice that was hard, however, was that I wanted to use full covered shocks, only because they had the right look for the period. A mounting bolt (that comes with your bicycle’s frame) will pass through the hardware axle and thread into the frame or the frame’s linkage, which secures the hardware and shock in place. A Trunnion mount shock mounts the shock body directly to the linkage – there are two threaded holes on the shock body and linkage bolts thread directly into them. Shock mounts also sometimes have holders or clamps on them that you can use to attach your microphone to them if you don’t want to or can’t use a threaded connection. Second, I think tube shocks look very cool. It's a Rode NT1 if that's any help. I center punch the hole, drill it and rough-cut the outline. This article might not cover every single rear shock question you might have, but it should hopefully provide you with some answers. A bushing is needed to allow for some rotational movement of the hardware axle when the rear linkage pivots – If there were no rotation allowed at all between the shock eyelet and the hardware axle, the rear linkage would not move freely and the rear shock would absorb all of the extra leverage, which is not ideal. Then I get after it with a big half-round wood rasp. “Sag” refers to the amount of suspension travel that is compressed when the bike is on flat ground under rider weight and riding gear. Setting the correct amount of sag on your suspension plays a crucial role in the overall performance of your full suspension mountain bike. Go to the pictures and let the captions explain how I did it. When you do not have enough sag, or the spring rate is set too high, you risk not utilizing all of your suspension travel, and again affecting the intended geometry and overall performance of the bicycle. The bushing we use and currently press into our shocks are called Igus bushings, they are on off-white cream color. Note how all of the edges are broken and sanded to a slight radius and the edges of the holes are gently chamfered with a big (5/8") bit. Take your shock pump off and find a place to cycle the shock through it’s travel 15-20 times. If you are riding on paved trails where you are mostly seated while pedaling, set sag when you are in the seated position. When you have too much sag, you do not have a high enough spring rate to support your rider weight. With air shocks, the first step is to charge the air spring (pump air into the air valve) to around 100 psi. Hardware axle and spacers. You can measure the stroke length by subtracting the eye to eye length when the shock is fully compressed, from the eye to eye length when the shock is fully extended – you should get relatively close to the shock’s stroke length. This meant that either the shocks had to mounted vertically inside the fender wells or I had to whack BIG chunks out of the already-finished fender wells to mount the shocks at an angle outward. the capsule mount is shock absorbent. If more than 6 turns preload are needed to achieve proper sag, you should change to a higher spring rate. This can result in pedal strikes and the suspension going through it’s travel too easily, and “bottoming out” often, and with rear shocks, this can result in pedal strikes and less pedaling efficiency. The type of hardware we use and install into our Double Barrel shocks is a traditional axle and spacer assembly. Subtract the eye-to-eye when in the ready position, from the shock’s fully extended eye-to-eye length, and that is your sag measurement. My choice of where to mount them on the differential was pretty much made for me too: Since the body was channeled, the edges of the fender wells came down over the axle tubes. It is important to understand that your rear shock size on your full suspension mountain bike is not measured by the amount of rear wheel travel, but by the eye-to-eye length, and the stroke length. Gravel / Adventure / Cyclocross, Everything You Need To Know About Rear Shocks, It is important to understand that your rear shock size on your full suspension mountain bike is not measured by the amount of rear wheel travel, but by the. The two images above would represent 24mm X 8mm hardware. I was able to use the short fittings on the front radius rods for the lower mounts of the front shocks. A shock mount is much safer, because it attenuates impact noise before it even reaches the mic. A 15mm open end eye simply means there is no bushing that is installed into that shock’s mounting eyelet. When I started trying to figure out how to install tube shocks on the rear, I spent quite a bit of time going back and forth with myself exactly what kind and length I should get. Their max extension is something like 14" and they compress to about 9 1/2" (don't take those numbers as gospel—I'm too lazy to look them up) and the distance with the spring unloaded was right at 14" so the choice wasn't hard. The edges are sanded straight and smooth on a cheap Taiwanese 4 x 36 belt sander. So, I made a set that was a little longer (rear). The final product. This is to ensure that the positive and negative air chambers are equalized. In most cases, there is a bushing that is pressed into the shock’s eyelet, which the hardware axle is then pressed into. Trunnion mounts have started to become more popular within the last few years with frame manufacturers. Riding on paved trails where you are mostly seated while pedaling, set sag when you have too sag... You might be thinking, why is setting sag so important through the shock n't. Little longer ( rear ) support your rider weight, with ⅜ ” and ⅝ ” the! 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