![]()
How can I make sure the bike will fit me?
The time draws near for
me to get a new bike and the last questions are all size related. When
ordering, should I get measurements from my old bike, or from my body? Keep in
mind that my old ride was the old familiar story: it wasn't quite the right
size (a little large), but it was last years model and a good deal. I have
always been an off-the-rack kind a guy, things seem to fit my very average
build pretty well right off the shelf. which parts (of my body or bike ) should
I measure to ensure a good fit.
Initially measurements of your self work well. They should include the
following. A. Height B. Inseam (measured from your crotch to the floor) C.
Torso (measured from your crotch to the top of your sternum, this is at the
base of your throat) D. Arm Length (measured from your armpit to the base of
your thumb) E. Shoulder width.
We will average your torso and arm length, then add a constant X. This will
give us a total effective top tube and stem length combined. We will subtract
out the associated top tube length per frame size to find you an appropriate
stem length. Inseam will become a factor in selection of crank arm length and
to confirm that the frame size will accommodate an appropriate seat post
exposure. Shoulder width will directly influence the width of your handlebars
(on a road bike).
Step through our sizing advice here: Take Me To Sizing
If you do decide to simply copy your current bike's fit, then
measure you effective top tube and stem length. Also check to see how much
lower your handlebars are than your saddle. We can easily duplicate these
numbers.
![]()
Does titanium corrode?
Titanium does not
corrode or oxidize like steel or aluminum. This is one reason for titanium's
use in the aerospace industry for hydraulic and fuel lines. The material is
light, very strong and will not oxidize. Titanium does not require painting or
material protection.
![]()
How stiff is titanium?
Titanium possesses a
natural tendency to flex under stress. Some flex is good in deflecting or
"dampening" vibrations and shocks transmitted through the wheels from the
terrain you are riding. Too much flex produces a frame that is inefficient, and
a percentage of the riders input is wasted rather than translated into speed.
Van Nicholas has gone to great lengths to maximize the stiffness
of our frames while maintaining choice riding characteristics. The down tube is
an oversized 40mm straight gauge tube of 3AL/2.5V titanium alloy. It is
bi-axially ovalized at the head tube and bottom bracket. More specifically, the
tubing at the bottom bracket is ovalized along its horizontal axis, producing a
tubing profile that is 46mm wide by 35mm high. This process allows a
significant increase in stiffness where the force from pedaling can cause
significant flex. Conversely, the tubing at the head tube is ovalized along its
vertical axis because the stress placed on the frame at the head tube tends to
be vertical in nature.
The top tube is an oversized 31.8mm straight gauge tube of
3AL/2.5V titanium alloy. It is ovalized completely along the vertical axis
producing a dimension of 29mm wide by 35mm high. This prevents flex that occurs
in handling your bike during turns, throws, sprinting etc.
The Super fortress rear triangle is comprised of a bi-axially
ovalized 31.8mm mono-stay with oversized (22.9mm) curved chain stays and seat
stays. Optimized for long armed brakes, the "S" curve seat stays produce
incredibly stiff braking performance. Additionally, the curved chain stays
provide increased heel and tire clearance. 7mm thick CNC machined vertical
dropouts finish the rear triangle and allow quick and easy wheel changes. Both
the dropouts and the mono stay provide the necessary eyelets and bosses for
those who would like to use a rack.
There are lighter frames available. Van Nicholas goal in
designing this bike was not to produce the lightest frame possible, it was to
produce a titanium frame that had great riding characteristics and was
affordable. Every Van Nicholas frame is under 4 pounds.
![]()
Can your frames be repaired?
Van Nicholas has not
come across a situation in which a frame needed to be repaired. The most
problematic area is welded titanium seat clamp bosses. This is where a seat
quick release is used on the frame. Van Nicholas avoids this complication by
using an aluminum seat collar that is easily replaceable if there were to be a
problem.
We have also heard of problems from other manufacturers who use
6/4 titanium for their dropouts, because the material is too hard, the dropouts
could not be realigned with available shop tools. Van Nicholas uses CP Titanium
for its dropouts, this allows for repair or alignment with standard shop tools,
should it be necessary.
![]()
Why do you use CP (Commercially pure Titanium) for your
dropouts, bottom bracket shell,
![]()
and head tube?
High grade CP
(Commercially Pure Titanium) plate is the best material for dropouts because it
is incredibly strong and easy to machine. In addition, Commercially Pure
Titanium permits wheel skewers to be secured more reliably in the dropouts
without fear of slippage. Slipping can occur in frames that use 6/4 titanium
for its dropouts because the material is harder and does not permit sufficient
"bite" for the skewer. CP Titanium will also permit the possibility of repair
or alignment with standard shop tools, should it be necessary.
As far as the head tube and bottom bracket shell are concerned,
we use a comparable grade 4 CP titanium billet. The reason we do this is CP
titanium is more than strong enough for the intended application and it is
easier and less expensive to fabricate. Both areas (H/T and B/B) are very
critical. Our factory has been building frames for over eight years using
Commercially Pure Titanium head tubes and bottom brackets without a failure.
The thickness of our bottom bracket shell is 3.5mm and the head tube is 2.5mm.
Because of the small area and the thickness used, we do not encounter problems
with flex or other problems that have occurred using CP titanium tubing. Some
companies early in the development of titanium frame manufacturing used CP
tubing and experienced many problems.
![]()
Why don't titanium frames use replaceable derailleur hangers
like aluminum frames?
Because of titanium's
strength and long fatigue life, it is not necessary to use a replaceable
derailleur hanger. The general consumer has been educated by manufacturers of
aluminum bikes/frames that this is necessary, and it is, for aluminum! Aluminum
fatigues 5 times faster than steel. If you were to bend an aluminum hanger, you
would not be able to bend it back without losing a significant amount of
strength in that area, hence, the replaceable hanger. The force required to
bend a 7mm titanium hanger is enormous. Van Nicholas and a number of other
titanium manufacturers use CP (Commercially Pure) Titanium for dropouts because
of its ability to be repaired (bent back into place) using shop tools. I
personally have never seen a titanium frame that has encountered this problem.
In addition, component manufacturers (Shimano, SRAM) have engineered a number
of their products with aluminum mounting bolts so that the bolt will actually
break off before damage is done to the frame.
![]()
What is your warranty policy if the hanger does break?
Our warranty like any
other bicycle company, is against manufacturer defects in materials or
construction. If your derailleur hanger was bent due to a semi running over
your bike, the resulting damage is not covered by the warranty. If on the other
hand, a defect in materials or workmanship is apparent in the frame, then we
would replace the frame with a new one without question.
![]()
What is headset spacing?
On a thread less
headset, 5mm-10mm spacers are used to raise the stem up from the headset. If
you are a very aggressive rider that feels the need for speed, few or no
spacers may be appropriate. Keep in mind that the fewer headset spacers used,
the lower your handlebars will be. Hence, you will feel "slumped over". If you
like your handlebars close to the height of your saddle, maximum headset
spacing will be required. The maximum amount of spacing for most forks is 30mm.
The exception here is any fork with a carbon fiber steerer. Forks with carbon
fiber steerers can use no more than 15mm of headset spacing. These are roads
forks. Note. If you like your bars close to the height of your saddle, use a
stem with a 105/32 deg rise.
![]()
What is cross chaining?
Cross chaining will do
damage to your chain and rear derailleur. It causes the chain to bend out of
its appropriate chain line and puts undue stress on the pivots of the chain. It
can also cause the rear derailleur to twist a bit to the left which will put
undue stress on the main pivot of the derailleur. Although Shimano has created
a 9 speed cassette, it isn't best to make the bike use all 9 speeds per front
chainring. A good general rule is to stay away from using the 2 rear cogs that
are opposite the front chainring in use. If you do continue to use your 12T cog
so frequently, you may also find yourself replacing your cassette sooner than
later. This is because your chain is not distributing its force evenly over
more cog teeth, which in turn will elongate the few teeth that you are using.
In time your chain will begin to skip over the teeth. Having the chain rub the
side of the big chainring while using the 12T cog, is not uncommon on any bike.
If we were to shim out the bottom bracket to the right to compensate for the
chain line, it would cause a worse situation in the opposite orientation
(53T,25T). It may also adversely affect the chain line we desire in the lower
gears (39T,25T). A more beneficial solution will be use a different gear
combination (53T,16T).
![]()
How does the stem angle and length effect the rise/distance of
the handlebars?
The relative position
of "horizontal" on a road stem is specific to the head tube angle of the frame.
For example the majority of our road frames have a 73-degree head tube angle,
consequently a corresponding stem with angle of 73 would produce a completely
horizontal alignment. Our Van Nicholas stems use an angle of 85 degrees so this
would give the rider two options.
Option one: in 85 degree alignment would produce a stem that
actually has a 12-degree rise. Option two: if the stem were turned upside down
the stem would have a 5-degree rise.
![]()
Is there any problem using titanium components with your
frame?
The important issue
here is that a Electro/Chemical reaction takes place when two pieces of
titanium are in direct contact with each other. For example, if you were using
a Ti seat post with a Ti frame, the two materials will actually bond together,
this process is called "gauling". To avoid gauling, it is necessary to use a
product called "Anti-seize" made by Finishline or an equivalent. The essential
components of this product are grease and ground up copper. The copper stops
the reaction from occurring and will permit easy removal of any titanium part.