CyberNinja Posted October 21, 2023 Share Posted October 21, 2023 Greetings, esteemed individuals. I am a recent arrival to this location. Despite doing an extensive search on this site, I have been unable to locate a satisfactory response to my inquiry. Apologies for any potential oversight on my part. The E400d estate vehicle is equipped with AMG 20-inch alloy wheels that include run-flat tyres. In light of experiencing three instances of alloy cracking and three instances of tyre replacement over the last six months, I am contemplating transitioning to a reduced wheel size and opting for non run-flat tyres. The local primary dealer has proposed the installation of a set of 19-inch wheels, although they were unable to provide confirmation about their compatibility, leading to a sense of surprise and disappointment. The recommended wheel specifications are 8J x 19 ET43 A21340105007x44 for the front and 9J x 19 ET53 A21340106007x44 for the rear. The offsets were deemed satisfactory; however, there was no guidance provided on the potential clearance of the inner circle in relation to the significantly larger brake discs situated at the front of the vehicle. Could someone kindly provide guidance on whether these options would be suitable or provide an alternate suggestion? I am indifferent to whether the wheels are original equipment manufacturer (OEM) or aftermarket; I would be OK with aftermarket wheels. Thank you very much. Quote Link to comment Share on other sites More sharing options...
ByteStorm Posted October 21, 2023 Share Posted October 21, 2023 If one consults the automobile handbook, it will provide information on the appropriate wheel and tyre size for the vehicle. I am really astonished by the occurrence of three wheel failures. In the event that any modifications or alterations are undertaken, I strongly recommend notifying your insurance carrier beforehand. Quote Link to comment Share on other sites More sharing options...
bvlenci Posted October 21, 2023 Share Posted October 21, 2023 Have you been regularly checking the air pressure in your tyres? The presence of low pressure is a crucial factor contributing to the occurrence of fractured wheels. Quote Link to comment Share on other sites More sharing options...
CyberNinja Posted October 21, 2023 Author Share Posted October 21, 2023 Hello. I express my gratitude for your assistance. Upon reviewing the handbook, it is evident that the content provided is somewhat broad in nature, since it regrettably lacks any specific details pertaining to the compatibility of wheel sizes. I am grateful for the consideration - it had not been within my contemplation. Quote Link to comment Share on other sites More sharing options...
CyberNinja Posted October 21, 2023 Author Share Posted October 21, 2023 I possess a strong understanding of tyre pressures. Regrettably, the state of the road infrastructure in East Sussex is really unsatisfactory. Numerous individuals, including my spouse and acquaintances, have had vehicular damage as a result of encountering potholes. Furthermore, the local tyre establishment has reported the need to repair six fractured alloy wheels using welding procedures. In July, the automobile was transported to France, where no instances of road potholes were seen. Quote Link to comment Share on other sites More sharing options...
WiseSage Posted October 21, 2023 Share Posted October 21, 2023 Does an online brochure exist? If applicable, it would be informative to ascertain the standard size and optional size wheels for each trim or version, with the assumption that there are no non-standard improved brakes present. The gasoline flap cover displays the wheel sizes, which may include all variations of the model rather than being specific to your own vehicle. What is the current amount of space between the wheel and calliper? Quote Link to comment Share on other sites More sharing options...
WiseSage Posted October 21, 2023 Share Posted October 21, 2023 A relevant example may be found in the E Class textbook, namely on pages 48 and beyond. Quote Link to comment Share on other sites More sharing options...
CyberNinja Posted October 21, 2023 Author Share Posted October 21, 2023 Greetings and thank you for your valuable time and insights. Excellent suggestion - I have come across an electronic brochure pertaining to my vehicle, which indicates that none of the 19-inch wheels were offered as optional features for my specific model (please refer to the attached document). However, it is worth noting that a 19-inch wheel was specified for the E53 model, which presumably has the same dimensions for the brake discs and callipers as my vehicle. There is a possibility that they might be compatible... The distance between the inner circle and the calliper measures about 2 centimetres, while there is an approximate distance of 8 millimetres between the calliper and the spokes. I want to exert some pressure on my primary dealer, since it is expected that they possess the capability to provide me with a direct and unequivocal response to this matter. What are the advantages and disadvantages of transitioning from run-flat tyres to non-run-flat tyres? Is it possible to maintain the current tyre size and anticipate a little increase in flexibility in the sidewalls? I express my gratitude one again. Quote Link to comment Share on other sites More sharing options...
jennycarlotta Posted October 21, 2023 Share Posted October 21, 2023 I recommend consulting the website wheel-size.com for the desired information. Quote Link to comment Share on other sites More sharing options...
WordSmith Posted October 21, 2023 Share Posted October 21, 2023 I am considering pursuing a similar course of action. Both front wheels have experienced structural damage, resulting in the requirement for welding and straightening. It has come to my attention that one of the wheels has once again become detached, necessitating a return visit to the wheel expert for repair. I spoke with a professional specialising in wheel mechanics about the potential downsizing of my wheels to a diameter of 19 inches. The expert conveyed that the 19-inch wheels are not exempt from issues and need comparable maintenance to their 20-inch counterparts, as seen by the same frequency of repairs conducted on both Mercedes models. According to their perspective, it was said that wheels measuring 18 inches have more strength. I started an examination of aftermarket forged 18-inch wheels available on the online marketplace eBay. However, I encountered a significant number of instances where these wheels had cracks and had undergone subsequent welding repairs. Consequently, I find myself in a state of uncertainty on the appropriate course of action to pursue. I am reluctant to allocate a significant amount of financial resources towards the acquisition of 18-inch forged wheels and fresh tyres, since there is a concern that these components may experience structural failure in the form of cracking and buckling. Quote Link to comment Share on other sites More sharing options...
WiseSage Posted October 21, 2023 Share Posted October 21, 2023 From a personal standpoint, I would not recommend opting for 18-inch wheels as they may seem incongruous on your vehicle. Instead, I would suggest considering 19-inch wheels as they provide a more balanced solution. If, as you assert, 18s are equally unfavourable, what rationale exists for transitioning to them, given that they will not exhibit aesthetic appeal? It is important to note that this statement is just reflective of my own perspective. Quote Link to comment Share on other sites More sharing options...
jennycarlotta Posted October 21, 2023 Share Posted October 21, 2023 Upon careful examination of the accompanying documents, it is evident that the AMG Line Edition and the AMG Line Night Edition exhibit similar callipers and, in all likelihood, possess identical disc dimensions. Hence, based on theoretical considerations, it can be inferred that the 19-inch wheels, which are originally installed on the AMG Line, are expected to be compatible. Naturally, the optional accessories offered by the manufacturer mostly pertain to bigger wheel diameters rather than smaller ones, hence explaining the absence of the latter in the presentation. The hybrid vehicle, equipped with 18-inch wheels, exhibits a noticeable reduction in calliper size. If my calculations are accurate, decreasing the diameter by 1 inch is expected to result in the wheel being around 12-13mm closer to the calliper. Therefore, it is reasonable to assume that the size adjustment should be acceptable. What is your insurance company's perspective on the installation of smaller wheels? It is likely to be deemed acceptable if it can be adapted to other models that have similarities with yours. This is because, in actuality, the distinction lies mostly in the amount of trim rather than a more potent variation. In relation to the remarks made by Cabrio Chap, it has come to attention that several discussions have taken place on this platform about the occurrence of damaged 19-inch wheels. It seems that BMW vehicles are also experiencing similar problems. Quote Link to comment Share on other sites More sharing options...
CyberNinja Posted October 21, 2023 Author Share Posted October 21, 2023 I express my gratitude for your assistance. This resource is really valuable. Regrettably, the Night Edition, which has distinct front discs, is not included under the aforementioned coverage. I appreciate the consideration, however. Greetings Quote Link to comment Share on other sites More sharing options...
CyberNinja Posted October 21, 2023 Author Share Posted October 21, 2023 I express my gratitude for your assistance. The Night Edition callipers and discs may possess identical dimensions, with the only distinction being the presence of vented discs. I express my gratitude for your kind words. I will return to this location once obtaining a conclusive response from the dealer subsequent to exerting assertive influence. Greetings Quote Link to comment Share on other sites More sharing options...
CyberNinja Posted October 21, 2023 Author Share Posted October 21, 2023 The news is unfortunate. The situation presents a significant difficulty, does it not? The provision of Mercedes Roadside Assistance services including the option to transport the vehicle owner to their place of residence, rather than only to the closest authorised dealership, would be a favourable improvement. I am uncertain about the appropriate course of action if 19's possess an equivalent level of severity. It is unexpected that there would be an increase in side wall size. The situation becomes significantly transformative when one is unable to go outside without harbouring concerns about returning safely to one's home. Thank you for providing the information. Please inform me of your decision. Greetings Quote Link to comment Share on other sites More sharing options...
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