--- title: Getting the Best Fit for Your Vehicle description: Read the following blog post to learn why our VSI forms are so important and which one you need to select. image: https://intblog.onspot.com/hubfs/Blog_images/640pxl%20%20Pictures/installation4-3%20640-1.jpg --- [![](https://www.onspot.com/imagevault/publishedmedia/ewjmu1x672ip2pj4oovu/Onspot_Logo.png)](https://www.onspot.com/en-US/) - [Why Onspot](https://www.onspot.com/en-US/why-onspot/) - Knowledge - [Overview](https://www.onspot.com/en-US/knowledge/overview/) - [Ways to increase traction](https://www.onspot.com/en-US/knowledge/ways-to-increase-traction/) - [For fleet managers](https://www.onspot.com/en-US/knowledge/for-fleet-managers/) - [For drivers](https://www.onspot.com/en-US/knowledge/for-drivers/) - [For mechanics](https://www.onspot.com/en-US/knowledge/for-mechanics/) - [Rules & regulations](https://www.onspot.com/en-US/knowledge/rules--regulations/) - [Knowledge Center](https://knowledge.onspot.com/en-us/knowledge-center-for-winter-driving-and-traction) - The product - [Overview](https://www.onspot.com/en-US/the-product/overview/) - [Testimonials](https://www.onspot.com/en-US/the-product/testimonials/) - [FAQ](https://www.onspot.com/en-US/the-product/faq/) - [Documents, manuals and brochures](https://www.onspot.com/en-US/the-product/documents-manuals-and-brochures/) - [How it works-videos](https://www.onspot.com/en-US/the-product/how-it-works/) - [Measuring forms](https://www.onspot.com/en-US/the-product/documents-manuals-and-brochures/sales-brochures2/) - About - [Overview](https://www.onspot.com/en-US/about-onspot---about-us/overview/) - [History](https://www.onspot.com/en-US/about-onspot---about-us/history/) - [News & Press releases](https://blog.onspot.com/news-press-releases) - [Regional Manager Contact](https://www.onspot.com/en-US/about-onspot---about-us/regional-manager-contact/) - Blog - [Blog articles](https://intblog.onspot.com/en-us) - [All about automatic tire chains](https://knowledge.onspot.com/en-us/all-about-automatic-tire-chains) - [Traction aids for heavy vehicles](https://knowledge.onspot.com/en-us/traction-aids-for-heavy-vehicles) - [Support](http://support.onspot.com/en-US/) - [E-Training](https://www.onspot.com/en-US/e-training/) - [North America](https://onspot.com/?s=false) - [Contact us](https://www.onspot.com/en-US/contact-us/) # Getting the Best Fit for Your Vehicle Written by [Ulrik Andersson](https://intblog.onspot.com/en-us/author/ulrik-andersson), May 26, 2022 When choosing Onspot, most of the guess work is taken out when it comes to fitting and installing the automatic tire chain system. This especially shows on the VSI forms, or “measuring” forms. Continue reading to find out more information on the fitting process! Getting the correct Onspot system starts with the VSI forms. VSI stands for vehicle suspension information, and when properly and carefully filled out, it provides as much info about the vehicle being fitted as possible. With more and more options being available on trucks in the modern market, Onspot engineers need to know exactly where each component around the differentials are. This includes brake chambers, driveshafts (especially the yolks), and exhaust systems. When the engineering team knows where each of these parts are, they can then plug the numbers into AutoCAD and produce the best fitting kit for your specific vehicle. That way, when the kit is installed, there are minimal adjustments needed, with just fine tuning to get the correct angles of the chainwheel. There are many VSI options to choose from when measuring. Consult your dealer or vehicle manufacturer to find out what suspension is under the rear of the vehicle. You can also [reach out to your local regional manager](https://www.onspot.com/en-US/find-us/) to find out more info or get help. Click the button below to find the best VSI for your application! [![How to Measure Your Vehicle](https://no-cache.hubspot.com/cta/default/1905643/5f3fc409-ea4e-42bb-8af2-a20cc784db32.png)](https://cta-redirect.hubspot.com/cta/redirect/1905643/5f3fc409-ea4e-42bb-8af2-a20cc784db32)   [configurator](https://intblog.onspot.com/en-us/topic/configurator) [VSI Form](https://intblog.onspot.com/en-us/topic/vsi-form) [suspension type](https://intblog.onspot.com/en-us/topic/suspension-type) ![Ulrik Andersson](https://intblog.onspot.com/hubfs/Ulrik%20Andersson%202024%2016-9%20vertical_edited%20II.jpg) #### About [Ulrik Andersson](https://intblog.onspot.com/en-us/author/ulrik-andersson) ## Comments ### Subscribe to blog updates ### Recent Posts ### Posts by Topic - [automatic tire chains (66)](https://intblog.onspot.com/en-us/tag/automatic-tire-chains) - [Commercial Driver (43)](https://intblog.onspot.com/en-us/tag/commercial-driver) - [Fleet Managers (38)](https://intblog.onspot.com/en-us/tag/fleet-managers) - [onspot (37)](https://intblog.onspot.com/en-us/tag/onspot) - 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