RocketMAX

The suspension on your Cotic droplink bike is designed to work at it’s best when the suspension ‘sags’ with the rider on board the bike. 'Sag' is the amount the shock compresses with a rider on board. The suspension works at its best when set with between 28%-30% of the available travel as sag, with our preferred starting point being 28%.

Your RocketMAX Gen4 runs any of the following shock options:

• 65mm stroke - 160mm travel - Fox Float X2, Cane Creek Kitsuma Coil or Air, Rock Shox Super Deluxe on Gold and Platinum builds
• 62.5mm stroke - 155mm - Rockshox Deluxe Select Plus on Silver builds
• 60mm stroke - 150mm travel - Not currently offered from the factory, but an option if you have a shock of your own

For sag settings this results in:

• 18-19mm sag on the shock
• 34-40mm sag on a 170mm fork
• 32-38mm sag on a 160mm fork

As a starting point we suggest 18mm sag rear, and 38mm sag front (170 fork), 36mm sag front (160mm fork).

There is a Cotic sag setup video over on Youtube

How To Set Your Shock Sag - Air

Using a shock pump, put 170psi in the rear shock. Leave your forks as they are (if you've already set them up) or put the recommended pressure for your weight in them according to the fork manufacturer's manual.

Check the shock and turn off any lockout or Climb Switch. This allows the shock to compress unhindered and ensures a more accurate sag measurement.

Put your riding kit on. Or at least a fully loaded backpack if you usually ride with one. Make particular note of the amount of water in your pack or your bottles. It's probably the heaviest thing you strap to your bike after yourself, and it makes a difference to the suspension setup.

Set the saddle to your correct full pedalling height.

Mount the bike and go for a quick ride in a suitably quiet area. Whilst riding, bounce on the saddle a couple of times to get the rear shock compressing as much as you can.

Pull in somewhere safe, stop, get off the bike and slide the o-ring on the shock down against the seal. Now get back on the bike and with saddle at full height sit down and let your legs dangle off the pedals and make sure the o-ring on the shock is still up against the seal. Now, gently get off the bike without moving the shock (dropping the saddle and using a kerb or something as step helps).

Once off the bike, measure the distance between the o-ring and the shock body. Adjust the air pressure in the shock accordingly to get the desired amount of sag.

How To Set Your Shock Sag - Coil

Coil shocks may also be used if desired if Cotic state your frame is compatible with one. Always seek advice from Cotic for spring rate. We need your weight in riding kit with any pack and water on board. This can add up to 7kg to your "bathroom scales in the morning" weight, which is significant.

Our bikes are progressive in nature and require stiffer springs than usually suggested by 3rd party suppliers and online spring calculators. If using a spring without the advice of Cotic it will void your warranty. Too soft a spring leads to frame damage.

If using a coil shock, go through the process above, but get someone to measure the eye to eye length of the shock with you on board to estimate the loaded length, then take this away from the unloaded length to get sag. For example:

The rider sits on board and measures 209mm eye to eye length. 230 – 209 = 21mm sag. At this point the rider needs to add some preload to get the desired sag of 19mm.

You must not use more than 2 full turns (2mm) of preload on the spring measured from when you just take up the slack and stop the spring rattling loosely on the shock. If your shock manufacturer recommends less than this, use that guidance. If your shock manufacturer approves more than 2 turns of preload, you must still only use 2 turns of preload. Your Cotic frame warranty is void if you use more than the manufacturer suggested preload, or the 2mm limit specified here, whichever is the smaller. If you need more than 2 turns of preload, you need a stiffer spring anyway. For example, 2mm of preload on a 500lb/in spring is 40lb of preload. At that point you really need the 550lb spring with no preload.

Due to the progression rate on our frames, always ask us what spring rate you need for a coil shock. Never trust an online spring calculator as they don't account for the design of our frame.

How To Set Your Fork Sag

Once you’ve set the rear sag, check the front fork sag. If your bike is brand new, put 60psi in the fork to start with and dial all the compression damping adjuster to minimum. For forks, we recommend running with 20-25% sag.

In a quiet area with minimal traffic, drop the saddle and ride around slowly, giving the forks a bounce once or twice to free them up. Whilst rolling along, sit down and – being careful of the spinning wheel - slide the o-ring on the fork leg down to the seal. Now stand up slowly into a balance position on the bike as if you're about to do a downhill section of trail. Now, without moving the fork any more, move yourself rearward and sit down, and slowly roll to a halt. If you have to use the brake, use it very gently and carefully so that you don't dive the fork under braking and mess up your sag measurement. Gently get off the bike and measure the distance from the o-ring to the fork seal. That is your sag. For a 170mm fork, you should be aiming for around 34-40mm sag (20-25%).

If the fork sag requires alteration, alter it, then check the rear sag again. Keep doing this procedure until both front and rear sag is set as desired by the rider, within the manufacturer recommendations for the frame and fork.

Volume Spacers

Volume spacers are an important part of the tuning kit, and are mainly changed depending on rider weight. Our forks and shocks come stock with volume spacers set for a rider around 75kg. If you are lighter than this, we recommend adding one volume spacer to the fork for every 10kg lighter than than 75kg you are. If you are heavier tan 75kg, we recommend removing one volume spacer per 10kg heavier you are. So, for instance, Paul is 65kg and would add one volume spacer to a Rockshox or Fox fork, or moves the adjuster down one click on the HELM. For Cy at 85kg, he removes one spacer from a Rockshox or Fox fork, or moves the adjuster up in a HELM.

On the shocks, they are slightly less sensitive to rider weight, but if you are a lighter rider and feel you want some more support from the shock or it's using its travel a bit easily for your liking, add a volume spacer. If you're heavier than 75kg and finding the shock not using all it's travel easily, drop a spacer out.

Weight Distribution

It’s worth noting that as the weight distribution of all bikes is different, being dependent on saddle position, stem length and bar width amongst many other things. It’s quite possible that with the correct sag at the rear of the bike, your forks may end up with too much or too little sag because there’s more or less weight on them compared to your previous bike. This is why we don't recommend any particular pressures, because even quite subtle differences in your saddle/cockpit set up compared to anything we measure will result in different pressures being required for a given level of sag. We always recommend setting up using sag measurement as your guide, not a generic shock pressure.

How To Set Damping - Shock

Once the front and rear sags are set, adjust the rebound and compression damping to your preference. If you have specified the Cane Creek Kitsuma Air or Coil or Fox Float X2 shock, then our base setup is on the shock when it's delivered. These settings are listed below all relative to fully open position on the adjusters:

Kitsuma Air

• 1 x large volume spacer
• 0.5 Turns HSC (High Speed Compression)
• 3 Clicks LSC
• 0.25 Turns HSR
• 1 clicks LSR

Kitsuma Coil

• No more than 2 turns preload (see explanation above)
• 1.0 Turns HSC (High Speed Compression)
• 5 Clicks LSC
• 0.5 Turns HSR
• 2 clicks LSR

Fox Float X2

• 1 x 0.6" volume spacer
• 1 Click HSC (High Speed Compression)
• 4 Clicks LSC
• 2 Clicks HSR
• 5 clicks LSR

Rockshox Deluxe Select Plus

• 2 x volume spacers
• MM tune
• 3 clicks Rebound

Follow the excellent instructions in the Cane Creek Field Tuning Guide (click here to download) for fine tuning of your Cane Creek shock.

Cotic base settings tend to run on the lively and fast rebound side of things. This might feel quite different to what you were previously used to, but do stick with it for a couple of rides before making changes. Light rebound damping let's the rear wheel 'patter' and maintain traction better. The links to the base tune for your Cane Creek shock can be found above in the Component Sizes tab.

For other shock brands:

Rebound

It is recommended to start with the rebound 3 clicks from fully open. As mentioned above, we believe that the fastest rebound you can run with safely is the best for traction and lively feel. If you feel like you’re being bounced out of the saddle on big compressions, or springing back too hard off drops, or the bike feels like it’s bouncing back at you at high speed on rocky sections, then add more rebound damping until this sensation is eliminated.

Compression / Pedal Platform

It is recommended to start with the compression damping/pedal platform switched off (or set to minimum). The Cotic Droplink suspension is designed not to require the assistance of a compression damping circuit to give good pedalling performance. Using the minimum setting allows the suspension to move under bump forces more easily and track the ground better.

How To Set Damping – Fork

As with the rear shocks, we recommend running the fork damping as light as possible for best traction.

Rebound

Set this in the middle of the range and see how it feels matched up to the rear shock. As with the rear, try riding it faster than you ordinarily would. It's amazing what a difference it makes, and it's key to getting the most out of the fast acting rear shock, because it keeps the bike in balance.

Once you have done a couple of rides, if you feel the in higher speed bumpy trails the fork is kicking back too much for your liking, or too much that you lose confidence, then increase the rebound damping. If you find the middle setting OK, trying making it faster until you get to the point of it feeling sketchy, then go back one click.

Compression

Almost regardless of size, weight or style of riding, everyone at Cotic runs the high speed compression damping on their fork fully open, or very close to it. We recommend you start with fully open and go from there. If you find you are using the full travel a little too easily for your liking, we suggest adding 1 volume reducer to your fork air spring rather than ramping up the damping.

For low speed compression damping, this is a balance between traction and helping keep the fork held up, so for this we recommend starting with it set in the middle of the range. If you are finding that the bike feels confidence inspiring, but it's a little uncomfortable or 'chattery' through your hands, try reducing the low speed compression 3 clicks. If you feel that the sag and air spring feel is what you want but you are getting a lot of diving under heavy braking, or in steep terrain, try adding 3 clicks. Keep refining like that until you are happy with the setup.

A Bit of Advice

One thing to avoid is setting the rebound based on the 'bounce in the street' test. This usually results in setting the rebound too slow for good grip in trail riding conditions, because doing the 'bounce test' with rebound set fast enough for good performance usually feels too fast in this unhelpful scenario. Only start adjusting once you have a feel on the trail.

Try It Out – The Only Way You'll Know Is By Going For A Ride

We recommend starting at 18mm shock sag and going for a couple of rides to see how this feels. This is a good middle ground for tackling the trails with an active, plush feel combined with a low bottom bracket height for confident handling.

If you feel that you’re catching your pedals too often, or the steering isn’t as fast as you’d like, or you're not getting the climbing position you want, then add more air to the shock and reduce the sag 1 or 2mm, or maybe drop the sag on your fork a few extra millimetres to move your weight forward.

It's well worth taking a couple of hours and doing laps of a trail you know well, and making changes one at a time. A good way to learn it to turn one damping dial fully closed, do a run, then go again with it fully open. You will learn what these big changes to damping do to the bike, which will help you make more subtle changes afterwards.

Take Some Notes Before Tweaking

With all the adjustments available on modern suspension it’s quite possible to get lost chasing a set up and ending up with a bike that doesn’t handle too well. So, if you’ve twiddled and tweaked and the handling just seems to be getting worse, go back to your base setup.

Don’t be afraid to experiment with your suspension settings and general bike setup (stem length, bar height, etc), but always have a base set up written down that you can go back to. This should include a fork travel (if the fork is adjustable) with air pressures for front suspension units. Note down how many clicks of rebound you're running. Same goes for compression damping if its adjustable on your fork.

As your experience grows, you’ll begin to know what certain adjustments do and how to undo them, but it’s a learning curve so keep your head and don’t be afraid to start from scratch.

We really think you could get more out of your bike by playing around with things a little. We're always happy to help if you want advice. Just drop us a line at info@cotic.co.uk

Our service doesn't stop when you order a frame. We want to help you enjoy your new bike to its full potential.