HyperStem
From
54g
Stiffer, lighter, tougher Design and dimensioning are impressive, mass and stress concentrations have been further reduced
Silver Limited Edition
- Description
- BIOMETRIC FITTING CHART
- How to measure
- Size-Weight Chart
- UNI / DIN
- Tech Tips
- Manuals
- Spare Parts
Tech info
Description
HyperStem Full Black version.
Fits 31.8mm handlebars, and 1'-1/8 steertubes.
Suitable for Enduro, X-C, Gravel and Road-Racing uses.
3D cnc oversized and ultra rigid body.
Special Titanium GRD5 torx T15 bolts, black PVD coated.
Material: fully 3D cnc'd from AL 7075 Txx
Bar clamp width: 44mm
Fork clamp height: 38mm
Minimum insert: 32mm
BIOMETRIC FITTING CHART
How to measure
Size-Weight Chart
Nessuna immagine disponibile
| Length |
40mm |
60mm |
70mm |
80mm |
90mm |
100mm |
110mm |
120mm |
130mm |
| 0° |
54 |
X |
X |
X |
X |
X |
X |
X |
X |
| 6° |
X |
61 |
65 |
69 |
74 |
79 |
83 |
87 |
91 |
| 12° |
X |
X |
X |
69 |
74 |
79 |
83 |
87 |
X |
| 18° |
X |
61 |
65 |
69 |
74 |
79 |
83 |
87 |
X |
| 1.25 6° |
X |
X |
X |
69 |
74 |
79 |
83 |
87 |
X |
UNI / DIN
Safety requirements
All our products excede Uni/Din safety standard requirements.
As general rule just realize that Uni/Din safety standard tests take as reference a 90kg. (200Lb.) extremely strong athlete at his maximum possible output.
Then repeat this loading efforts on a base of 100.000 times for each testing session.
Are you as strong as the athlete described?
If yes plan to replace your frame/component at the end of the racing season.
A good racer output 20% lower loads and that doubles at least the fatigue life of a component.
The loads applied by an average rider will affect only marginally the fatigue life of the bike parts.
Rider weight influence
The rider weight plays an important rule but it's only a part of the energy q.ty count that is applied to your bike components.
Here few examples that surely help to understand how other factors can do much more that body weight alone.
1) Speed itself increases by square factor the loads applied on a front wheel hitting an obstacle.
Thereafter when a front wheel hits a small-medium obstacle the following factors play the most important rules:
- speed itself - obstacle sharpness - tire pressure - suspension fork setting if any.
2) Personal riding style can put limited or extremely high loads on a rear wheel too.
During off saddle sprinting the bike get angled under rider's body.
T his strongly increases the lateral stress on the rim-spoke structure.
Rider weight influences directly the load but the angle of the bike does it by the angle-log.
3) Low gear ratio as on 29ers pushed by a strong rider can produce over 700kgf of chain-pull.
The chain-pull load passes through the right crank-bearing, then through the frame right chainstay and finally reaches the hub-freewheel.
Lower gear ratios directly increase chain pull peaks and the mechanical stress on crank axle and bearings, rear hub (axle and bearings) and its freewheel engagement system too.
A combination of extremely high loads for the entire rear-end of the bike.
Tech Tips
Bolt tightening
The special M4 bolts of HyperStem at 2Nm pull about the same of a regular M6 bolt at 4Nm.
Note also that we recommend those mild tightening torque values in order to protect the steer tube and handlebar surfaces that are often very weak due to the fully absence of transversal fibers.
HyperStem bolts can withstand over 5Nm but do never tighten them that much for a number of good reasons.
Degrease well all contact surfaces, then lube only HyperStem bolts and tighten as for manual sequence.
Bar & fork combo
HyperStem stiffness is excellent and bench measurements show it well.
In the last 12 years it has been used by several world team athletes and by MTB world-champion too, and as many athletes of several other racing categories they have regularly purchased every Extralite part.
Additionally HyperStem is one of the most "carbon friendly" stem on the market since it features rounded edges at every joint.
However note that handlebar (especially its clamp area) and fork tube materials play a major rule on the stiffness and integrity of the whole combo. In-facts the construction of composite handlebar and fork tubes can be more or less reactive under clamping forces.
The reactivity under clamping forces is mainly supported by the presence of transversal fibers and unfortunately these are often fully absent on the majority of industrial products, including famous ones.
This will be even more important in case of lightweight handlebars.
When looking for weight reduction we can only recommend these Schmolke, Darimo for a proper fit and durability, very few hi-end lightweight products are made that properly and with the correct positioning of cross fibers at the clamp area.
Bar rotation
Handlebar type of construction and the conditions of contact-surfaces are the primary reasons of unwanted rotation when setting a lightweight stem-handlebar combo.
How to solve it:
- De-grease well bar and stem contact surfaces and precisely follow the tightening procedure of HyperStem manual.
- Do not use "grip pastes", under bench tests these proved to be totally useless, we do not recommend them.
- Remind to re-check clamp bolt torque after few test rides, as manual explains, that handlebar paint and surface may have shrunk under clamp pressure.
Never get tempted to over-torque the front clamp bolts
- That may easily ding and damage a weak handlebar surface.
- HyperStem can handle 50% overtorquing that may be applied to stronger alloy handlebars.
- When the over-torqueing get truly exaggerated it could bend even the HyperStem clamps and bolts.
HyperStem proved to work well for years with all properly made super-light hi-end handlebars.
Lightweight handlebar combos
- We warmly recommend to use only bars that feature crossed fibers at least at their central section (see Schmolke, Darimo and Extralite as best examples).
- That because the most common (and cheaper construction) methods employ only UD fibers and those react very poorly under clamping forces.
Those handlebars may work well only with conventional heavier stems.
Manuals
Spare Parts
Spare Parts
13,91 €
7,83 €
42,61 €
7,83 €
42,61 €