Why
Ovals
Designing a chain ring shape that is not round but oval with a combination
of Physics, maths and practical real world testing, has shown us
that some gains can be made. A smoother power stroke allows the
legs to work harder & more efficiently through the hardest parts
of the pedal stroke.
The dead spot
We have all experienced those moments when the climb becomes a challenge.
Suddenly the road goes up again, around a corner & steeper,
the pedalling becomes more a stabbing motion than a rhythmic one.
This is the result of a zone called the dead spot, which occurs
at the top and bottom of the of the pedal stroke 11.0clock –5.0clock
.To overcome this, more effort is required. By changing the shape
of the chain ring to an oval and then considering the position of
the major and minor axis points there are gains to be made.
History
The oval chain ring has been around for approx 100 years and is
not a new concept. Many companies have attempted to make chain rings
that will offer an advantage. Some have got it completely wrong,
whilst others have come close. We have successfully produced oval
chain rings for 15 years
Oval experience
By helping to remove the dead spot with the MDT oval, pedalling
now becomes a more natural experience. In fact the turning circle
seems more round. We have found that the slower the cadence the
greater the advantage.
Design
The shape of our chain ring is carefully worked out to give you
an advantage. The percentage of ovality and orientation of the oval
and its shape have been designed based on 15 years real world testing
on the road.
Uses
MDT oval chain rings are designed for climbing where gains can be
made. We have also found that some riders who choose to ride with
a slower cadence in the time trial prefer our oval ring design.
When using as an outer ring some minor height adjustments to the
front gear changer have to be made. Matched pairs of chain rings
can also be made available as well as triples.
Service unlimited
MDT offers a unique worldwide service. Making custom made chain
rings with the largest possible combination of size and crank arm
compatibility.
Material
Made from S07 –1021 certified aircraft grade alloy, which
offers high strength, excellent lateral stiffness & of course
superb wear rate. We use full CAD & CNC machine facility for
manufacturing all chain rings.
Specification
For use with 3/32” pitch chain & derailleur gear systems
*Other uses, contact
MDT for further assistance
Can also be made for single fixed gear.
Can also be made for
1/8” pitch chain
Inner ring available
Size available22 – 57 teeth
Larger on request
Outer ring also
available
Size available 20 –57 teeth
58 – 67 teeth
Larger on request
Finishes
Poly coated black
Hand polished
Natural Titanium colour
Each ring is engraved
with the MDT logo for mark of quality
Size is only limited
by your chain set capacity with smaller rings
Ordering requirements
When ordering your chain sets minimum size inner ring, add 1 tooth
to allow for oval design
We can make for any spider
combination with the exception of Rota due to its moving crank arm
design
Please specify the make
and model of your chain set.
Please specify type required;
inner – middle – outer
Questions answered
Is my oval ring compatible
with all makes of chain?
Yes
Is my oval ring compatible
with new 10 speed ?
Yes also with 7,8 and 9 speed
Should I use a new chain
when fitting my oval ring ?
Using new and replacing chains on a regular basis offers performance
advantages
Can I use my oval ring
with a round outer chain ring ?
Yes
Can I use a round inner
ring with a MDT oval outer ring ?
No as it will feel harder after using the oval.
Can I use my oval ring
with any other make of chain ring ?
Yes
Could my oval ring be
used as a single ring only ?
Yes, but please ask for further advice.
Will I need to adjust
my front changer ?
Yes you will need to adjust your front changer up slightly to allow
for oval shape
Does the oval chain ring
have advantages for time trial use?
Yes when larger gears are used or conditions get tougher
Will I notice a difference
when shifting from the outer to the inner chain ring?
Slightly for a second or two
Will it take me long
to get used to my oval chain ring?
No I found that it becomes a more natural experience with gains
How should I keep my
oval ring clean ?
Use only none petrochemical cleaners or warm soapy water
All prices include
P&P for UK
Overseas orders sent at best rate
£89.95 20–
39 Teeth
£99.95 40 –
57 Teeth
£110.00 58 –
67 Teeth * Bigger on request
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