Then circumstances put a fly in the ointment and they discover that a
basic change, perhaps even a few basic changes, to that setup seems to
make them ride better. It'll often be something as simple as a different
handlebar sweep, different tyre pressures or more suspension fork sag.
It’s often minor details of bike setup that change the way you ride, and
feel about, your bike.
Tweak your ride setup from time to time, then give yourself a few rides
to decide whether you like it or not. There are some things that feel
wrong when you first change them, but feel right after a few rides. In
the following article we’ll lay down the basic guidelines of bike fit,
together with variations to consider and the reasoning behind them.
Don’t think of a bike fit and setup as something that’s carved in stone.
Use our guidelines as a starting point, then go out and experiment.
Sitting comfortably?
This images below show the key areas that should be adjusted for you
to achieve optimum bike fit. The first image shows the incorrect
position, while the second image shows how the bike components should be
positioned. Good bike position results in relaxed shoulders and
slightly bent elbows
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Arms: Good bike position results in relaxed shoulders and slightly bent elbows.
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Saddle: Correct saddle position is essential for balance, control and pedaling efficiency.
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Knees: Having very slightly bent knees at the bottom of each pedal stroke is perfect.
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Frame: Getting the correct frame size is essential, but it’s only a starting point for perfect bike setup.
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Shifters and brake levers: Don’t just leave them in one position. Experiment with setting them further in on the bars or tilting them.
Although everyone is different – some folks may have longer legs but a
shorter torso, while others may have long arms but short legs – starting
with the correct-sized frame allows you to further tune the position
using stem, bar, seatpost and saddle tweaks.
Frame sizing
Manufacturers’ listed frame sizes can be confusing. One of the key
considerations is the top tube length. Have a read of our specific
mountain bike frame size article for our advice on
getting your frame size right.
What really matters is how the bike feels when you sit on it and
ride. The first thing you need to do, in the shop or on a demo ride, is
set the saddle at the right height.
Saddle height
A rough approximation of saddle height for efficient pedalling is your
trouser leg measurement plus 5in from the centre top of the saddle to
the centre top of the pedal. To work it out more accurately, with
comfort and efficiency in mind, sit squarely on your saddle with the
cranks in a straight up/straight down position. The saddle is at the
right height when your heel just touches the top of the lower pedal with
your leg straight; your crank should be right at the bottom of its
stroke. If you have to tilt to one side on the saddle to achieve this
position then the saddle is too high. Place your foot on the pedal in
the ready-to-pedal position. If your leg was straight with your heel on
the pedal it should be slightly bent at the knee in a pedalling
position. You should never feel as if you’re being forced to rock your
hips from side to side on the saddle while pedaling. You may need to make adjustments to this position according to confidence and comfort preferences, and depending on what
shoes
you wear. And keep in mind that this is all based on efficient pedaling
for cross-country trail riding. Many riders will choose to set their
saddles lower for difficult descents, hence the growing popularity of
dropper seatposts for big terrain riding.
Saddle position
As a rule, start with your saddle as level as possible on the top.
This is an efficient cross-country position but some riders will prefer a
slightly tipped back saddle for tricks, stunts and/or steep downhill
work, and a few who prefer the nose of the saddle slightly tipped down
for climbing or a more forward-biased ride posture. But dead flat is
right for most riders.
Saddle rails have a lot of fore/aft slide adjustment, and not all
seatposts are created equal. Some have set-back clamps, others have
clamps in line with the top of the post. This has a bearing on the
position you’re trying to achieve with your saddle. A saddle set too far
back can make the bike feel back-heavy, possibly even too light at the
front to achieve proper suspension fork compression. A saddle set too
far forward can cramp your ride position and make you feel as though
you’re putting too much body weight on the front of the bike.
In theory, if a bike has exactly the right reach for you and the
fork is set up properly, you’ll probably end up with the saddle set dead
centre on its rails. If you’ve got long arms for your height you may
end up with the saddle set well back: short arms and you’ll be looking
at inline seatposts and your saddle forward. You can use stem length and
handlebar position to fine-tune the way you sit over the bike too.
We’ve ridden a lot of bikes and discovered a few unusual aspects of
bike setup that can help explain why a bike feels wrong for no obvious
reason. One relates to saddle position. With your saddle at ‘perfect’
height, drop a plumb line from the centre of your saddle clamp to your
frame’s chainstays. With everything set up for general trail riding, the
plumb line should intercept the chainstays almost exactly halfway
between the bottom bracket axle centre and
wheel
axle centre. If it’s further back you’re probably sat too far back. Put
your saddle further forward for better balance, and to get the best out
of your suspension forks.
Handlebar reach
If you have access to different stem lengths and different shaped
handlebars, experiment with different ride positions, adjusting your
saddle accordingly. Arm, leg and torso length will vary between riders
of the same height and body weight distribution can have a major bearing
on setup. A rider with a big belly will demand a different bike setup
to a rider with a well distributed muscle mass or a heavy head – strange
but true.
A guideline for saddle to handlebar reach is to put the tip of your
elbow on the nose of the saddle and see how far your longest finger
reaches along the stem; forearm length is generally a good indicator of
full arm and torso length. Most riders looking for a fast and efficient
trail riding posture will discover that their longest finger reaches to
almost exactly halfway between the steerer top and the handlebar centre. You can fine-tune ride feel from that point by adjusting your seat
position, stem length and height, and handlebar type. Some handlebars
have a more generous backsweep than others, and you can turn bars in the
stem to tune your hold position/wrist angle. We know riders who like
their bars straight and others who find a 25-degree backsweep their ideal
solution. Keep that elbow tip to finger tip measurement in mind when
working out whether a test bike is the right size for you.
Handlebar height
How high you have your bars is a function of steerer height (and the
amount of adjustment washers on it), stem height and rise, and handlebar
rise. Some riders feel relaxed with their bars at roughly saddle
height, others (particularly cross-country racers) have them way below
saddle height to achieve a flat backed streamline posture on the bike. Relative beginners might feel at ease with the bars set higher than
the saddle. Bear in mind that you need enough body heft tipped towards
the front of the bike to compress your suspension fork when you’re
riding rough terrain. This becomes harder to achieve if your saddle is
too low or your bars too high.
Control positions
Brake levers and gear shifters can be put in different positions on
the bar. On most brakes you can adjust lever reach too, and on some you
can adjust the point of contact where the brakes compress the pads. We
know riders who put up with their thumbs rubbing on their gear shifters
for years before realising that setting them half an inch further
inboard on the bars solves the problem without making them harder to
use.
Bar width can be trimmed too: cutting an inch off either end of a
27in handlebar might make a difference to your ride comfort. Swiveling
bars a few degrees back or forth in the stem can also make a difference.
Don’t be afraid to try something different, but try it for a few rides
in order to find the pros and cons of a new setup.
Material benefits
The materials that your bike’s components are made from can have some
bearing on setup and comfort. Materials, and the way they’re used, have
the most effect at the major contact points (with the rider and the
ground). We’re talking about your tyres, your grips, your saddle and
your pedals.
Tyres: Tyre compounds, as well as pressures, will
affect the way a bike feels on the trail. Cleverly treaded dual compound
tyres with a high tpi (threads per inch) carcass construction will
generally deform more over rough terrain, and so grip better, without
any increase in rolling resistance. Cheaply made tyres tend to grip less
and are more prone to losing traction when under pressure, especially
in wet conditions.
Grips: Dual compound handlebar grips, or grips made
from soft foam, might not be as hardwearing as others but they’re far
more comfy, absorbing vibration and making you feel more at ease on the
bike on rough terrain.
Saddle: The right sort of surface material and the
right sort of padding on a saddle is obviously going to make a huge
difference to the way you feel about your bike. As a rule, you should be
able to move easily on the surface of a saddle; fancy embroidered
graphics aren’t always conducive to this. And don’t assume that more
padding is always better. Slimline saddles with minimal padding in just
the right places are often more comfy than big bouncy affairs, which
will often chafe after a while.
Pedals: The efficiency of your pedal/shoe interface
has an impact on how you ride. Stiff soled shoes with inset cleats fixed
to clipless pedals will make you a more efficient ‘full circles’
pedaller. But read instructions carefully when it comes to cleat
position because poorly positioned cleats can cause problems, especially
with knees. Most riders start with their cleats set dead centre in the
shoe recess, but that doesn’t feel right for everyone, and some
cleats/pedals offer more free float movement than others.
Comfort and control variations
Your tyres, suspension fork and rear shock effectively provide an
adjustable cushion between your bike and the ground. Setting them up
properly is crucial to your overall control and comfort. Big volume
tyres can be run at lower pressures than small volume ones, and big
volume tyres with a low knob profile will often roll just as fast as, and
offer more comfort and control than, skinny tyres.A good tyre pressure starting point for average weight riders on
typical 2.1in tyres is about 35psi. Careful or lighter riders will often
run under 30psi, especially on tubeless tyres where there’s no tube to
pinch puncture. Heavier, clumsier or harder-hitting riders might prefer
40psi+.Fork and shock pressures will vary according to make and model, but
aim for between a third and a quarter of the available travel as initial
sag when you sit on the bike. Also, take some time to learn about your
compression and rebound damping controls.
Wrong fit ailments
Aches and pains can be caused by aspects of bike setup, but also by
other things, so don’t take this list as gospel; it’s a rough guide. See
your doctor if something is really hurting, especially if it continues
to hurt after riding and it’s not solved by the adjustments mentioned
here. Be aware that a lot of your aches and pains on a bike are simply
caused by insufficient muscle support. In other words, you may just need
to ride more and do some core muscle training to work things out.
Here are some common ailments and their causes:
Knees: Knee pain when riding can be caused by your
saddle being too high or too low, or your shoe cleats being poorly
adjusted. Some riders find that a pedal/cleat system with more free float
gets rid of knee pain.
Back: Back pain during/after riding will often be
related to poor core muscle support so there may not be a quick and easy
setup fix. But try changing the position of your handlebars and/or your
reach from the saddle to the bars. We know a lot of riders who’ve solved
lower back pain simply by putting the stem up or down by half an inch,
or getting a handlebar with more backsweep.
Shoulders/arms/neck: We're putting these three
together because it’s often similar aspects of set-up that cause aches
and pains in these areas, namely too much stress being placed on these
bits of your body. This may be caused by being sat too far forward on
the bike but it can also be down to sitting too far back, making you
curl your shoulders and preventing you holding the bar properly.
Experiment with stem height and saddle-to-bar reach. Try different bar
shapes: a lot of riders find that more backsweep or upsweep on a bar will
make them feel far more comfortable. Also, try anatomically shaped
grips, which support your hands better.
Hips: A lot of hip problems among cyclists are
caused by the saddle being either too high, too low, tipped too far back
or forward or not offering the right sort of padded support.
