Despite all the attention, it happens again and again that you shorten the steerer tube too short and it lacks the deciding millimeters for the right handlebar position, or you take over a used frame, a complete bike, but the handlebars can not be mounted higher.
We recommend at first always to check the new or additional purchase. Often, however, this is no longer an alternative, as the original fork is no longer available due to old models from the manufacturer.
If all possibilities are checked, this is no reason to write off the bike. Based on our many years of experience in manufacturing, repair and modification, we can easily realize an extension of a carbon shaft.
The procedure and processing technology of our offered fork-leg extensions of carbon forks for models no longer available on the market, we have tested successfully without complaints at the company EFBE-Prüftechnik independently, objectively and transparently according to the ISO standard 4210-6: 2015 for forks of the category racing ( RD) to the corresponding critical load cases .
Our test specimen was an older Smolik Motivation Race SLX carbon fork, which was extended by 2 cm for test purposes. In the picture on the right you can see the shock test backwards - torsion test of the steerer tube.
In another test case, see picture left, you can see the test for tensile load of a non-welded fork in accordance with ISO standard 4210 of the Smolik Motivation Race SLX carbon fork supplied by us.
Overall, the test was successfully carried out without any complaints, and no parts of the unit relaxed or separated. In addition, there was no evidence of fatigue in the form of cracking.
The extension does not take place by a preparation / extension in the true sense, but by the technologically correct incorporation of an intermediate piece. Here, the position is selected so that the interface is largely stress and load free at a certain position with respect to the height of the head tube, and the desired final length.
For this reason, the specification of the head tube height is a prerequisite for the technically perfect implementation.
The maximum extension, which we offer and give warranty, are 40 mm. This limitation is based on the fact that the max. spacer height generally are 40 mm to the standard value.
Likewise, the warranty is limited to the specified parameters, ie head tube height and protrusion / extension. The fork is therefore no longer for a different configuration than the frame dimensions and the desired height you specify universally to use, but is then tailored to your specific frame, modified.
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