Confirmed Tire Fitment — 2024 GMC Sierra 2500HD Denali Ultimate

OWNER CONFIRMATION ADDENDUM — October 31, 2026 Supplied by the original vehicle owner after the two historical conversations below. This addendum explicitly identifies the installed tire size, vehicle, wheel dimensions and no-lift configuration. Earlier editorial notes about the confirmation excerpt lacking those details describe the historical excerpt; the owner now supplies the missing connection here. Tire brand/model, wheel offset and detailed test conditions remain unspecified. Owner-confirmed does not mean independently verified or manufacturer-approved. A successful installation of this size does not establish that it is the largest possible size. Confirmed Tire Fitment — 2024 GMC Sierra 2500HD Denali Ultimate Category: Automotive / Wheels & Tires Research type: Firsthand owner testing Evidence level: Owner-confirmed Featured research: Requested by owner; not activated as a site feature. Vehicle and Tire Specifications Vehicle: 2024 GMC Sierra 2500HD Denali Ultimate Engine: 6.6L Duramax Diesel Wheel dimensions: 22 × 8.5 inches Tire size: LT305/55R22 Approximate tire diameter: 35.2 inches (nominal; model-specific dimensions may differ) Suspension lift: None Rubbing: None reported Research Question What is the largest practical tire size that can fit a stock-height 2024 GMC Sierra 2500HD Denali Ultimate with 22-inch wheels without rubbing? Actual Results After researching tire sizes and discussing possible fitment configurations with ChatGPT, the owner selected LT305/55R22 tires for the truck’s 22 × 8.5-inch wheels. The owner subsequently installed the tires and confirmed: “The tires worked perfectly with no rubbing.” This documents a successful firsthand owner-reported fitment result for this particular truck and wheel configuration. Conclusion The owner confirms LT305/55R22 tires successfully fit their 2024 GMC Sierra 2500HD Denali Ultimate with 22 × 8.5-inch wheels and no suspension lift. Results may differ depending on wheel offset, tire manufacturer, alignment, suspension condition, and operating conditions. This entry documents a real-world result, not a universal fitment guarantee. Supporting Evidence • Owner-supplied before-and-after image — attached in Image evidence. Labels show before LT285/55R22 and after 305/55R22. Uploaded October 31, 2026; owner-supplied context, not independent measurement or verification. • Original ChatGPT research conversation: https://chatgpt.com/share/6ae61dc3-3538-83ea-ae52-8004befab9a2 • Owner’s original post-installation confirmation: https://chatgpt.com/share/6ae61f2b-0f9c-83ea-b224-15f94dccde09 • This additional owner statement records the installed size and no-lift configuration. OpenFindings Attribution Research creator: Donovan Hunter, original vehicle owner Evidence level: Firsthand owner-confirmed; not independently verified Reuse eligibility: Subject to OpenFindings’ future verification and royalty policies. No royalty eligibility or payment is established by this entry. --- ORIGINAL RESEARCH AND CONFIRMATION EXCERPTS PRESERVED BELOW --- COMBINED PRIVATE REVIEW DRAFT Two separate source conversations follow, with original messages and editorial notes kept distinct. Source A is AI sizing research. Source B is an owner-reported no-rubbing result on 22x8.5 wheels; it does not state tire size or model. The connection between the recommended tire and the reported installation must be confirmed before publication. No independent verification or royalty eligibility is asserted. SOURCE A OpenFindings import draft — not published Title: Stock-height GMC Sierra 2500HD tire sizing on factory 22-inch wheels Source: https://chatgpt.com/share/6ae61dc3-3538-83ea-ae52-8004befab9a2 Status: AI research conversation; not independently verified. EDITORIAL NOTE (not part of original conversation) This shared conversation includes changing AI recommendations and an initial lift assumption corrected by the user. The last answer recommends LT305/55R22. It does not contain a user-confirmed installation result or the later discussion of model-specific approved wheel widths. Original citation and product tokens are preserved; their targets must be verified before publication. Blank assistant entries and internal/tool messages are omitted. The text below preserves all nonempty user messages and final assistant text available in this shared conversation. ORIGINAL CONVERSATION USER: What size is lt285/55r22 124/121s 10 p.r tires? ASSISTANT: An **LT285/55R22 124/121S 10 P.R.** tire is approximately: - **Overall diameter:** **34.3 inches** - **Width:** **11.2 inches** - **Sidewall height:** **6.17 inches** - **Wheel:** **22 inches** - **Load range:** typically **Load Range E / 10-ply rating** - **Speed rating S:** up to **112 mph** So in common truck-tire terms, it's essentially a **34 × 11.2-inch tire on a 22-inch wheel**. For your **2024 GMC Sierra 2500HD Denali Ultimate**, if you're comparing this to a **35", 36", or 37" tire**, I can give you the exact metric sizes that will fit your factory 22" wheels and show the diameter difference for each. USER: Will the 36” ones fit ASSISTANT: Yes — but **not stock**. On your **2024 GMC Sierra 2500HD Denali Ultimate with the factory 22" wheels**, your LT285/55R22 is about **34.3" tall**. Moving to a true **36" tire** adds roughly **0.85" of radius**. With the **3" suspension lift you mentioned previously**, a ~36" tire is very realistic on the factory 22s. The bigger issue is **tire width and wheel offset**, not just diameter. Keeping the factory wheels helps because their offset keeps the tire tucked in better than many aftermarket wheels. If you tell me whether you want a **true 36" tire** or the **largest metric tire that's roughly 36"**, I can find the best size for your factory 22" wheels with the least rubbing. memcite USER: Largest metric ASSISTANT: For your **2024 Sierra 2500HD Denali Ultimate**, keeping the factory **22×8.5" wheels** and assuming the **3" suspension lift**, the metric size I’d target is **LT295/60R22**. That size works out to approximately **35.9" tall × 11.6" wide**, so it is essentially a **36-inch tire**. Compared with your current **LT285/55R22 (~34.3")**, it's about **1.6" taller overall**, raising the truck roughly **0.8" more from the tire alone**. I prefer **295/60R22 over 305/60R22** on your factory wheels. A 305/60R22 is about **36.4" × 12.0"**, but the added width starts making clearance at full steering lock more questionable and can push tire manufacturers' preferred wheel-width specifications. Your factory-style 22" wheels are **8.5" wide**, and GMC offers 22×8.5 wheels for the Sierra HD platform. citeturn295102search0 So I'd rank them: | Size | Approx. diameter | Width | My take | |---|---:|---:|---| | **285/55R22** | 34.3" | 11.2" | Your current size | | **305/55R22** | 35.2" | 12.0" | Wider, but not much taller | | **295/60R22** | **35.9"** | **11.6"** | **Best choice for ~36"** | | **305/60R22** | **36.4"** | **12.0"** | Maximum I'd consider | | 325/55R22 | 36.1" | 12.8" | Too wide for what I'd want on the stock 8.5" wheel | There are documented 2024–25 Sierra 2500HDs running even **37-inch tires on 22×8.5 wheels with approximately +44 mm offset**, so your wheel geometry can work with large-diameter tires; suspension clearance and trimming become the determining factors. citeturn295102search3 **My pick for your truck: LT295/60R22.** It gives you essentially the **36" look** while staying relatively narrow, which is especially useful with the high-positive-offset factory wheels. If you want, I can find **which 295/60R22 tires are actually available right now** in Toyo, Nitto, Falken, BFGoodrich, etc., and compare weight, load rating, price, and actual measured diameter. memcite USER: With no lift. ASSISTANT: With **no lift**, I would **not** recommend 295/60R22 on your 2024 Sierra 2500HD Denali Ultimate. Your current **285/55R22 is about 34.3" tall**. A **295/60R22 is about 35.9"**, so it adds roughly **0.8" of radius** at the wheel opening. On a stock-height HD, that can create rubbing at full lock or under suspension compression, especially around the liner and mud-flap area. The safer “largest metric” target on the factory 22s is **305/55R22**, which is about **35.2" tall**. Even that can be close depending on the exact tire’s measured dimensions. So for **no lift**: **Best bet: 305/55R22** **Possible but more likely to rub: 295/60R22** **I would avoid 305/60R22 stock-height** If you want, I can check **actual fitment reports for a 2024 Sierra 2500HD Denali Ultimate on factory 22s with no lift** and tell you the largest size people are running without trimming. USER: Tell me the largest please ASSISTANT: For your **2024 GMC Sierra 2500HD Denali Ultimate, completely stock suspension and keeping the factory 22" wheels**, I would call **295/60R22 the largest metric size worth attempting**. That's approximately **35.9" × 11.6"** — essentially a **36-inch tire**. There are reports of stock 2024 2500HDs running roughly 35–36" diameter tires, but once you get into this range, exact tire dimensions matter and minor rubbing at full lock is possible. For example, owners report **295/65R20 (~35.1")** as a maximum stock-height size, while 35" tires on stock wheels have also been reported with little or no rubbing. citeturn0reddit37turn0reddit42 So I'd break it down this way: | Size | Diameter | Width | Stock height | |---|---:|---:|---| | 285/55R22 | 34.3" | 11.2" | ✅ Easy | | 305/55R22 | 35.2" | 12.0" | ✅/⚠️ Very likely | | **295/60R22** | **35.9"** | **11.6"** | **⚠️ Largest I'd try** | | 305/60R22 | 36.4" | 12.0" | ❌ Too aggressive | | 37×12.50R22 | ~37" | 12.5" | ❌ Level/lift needed | **I'd choose 295/60R22 over 305/55R22 for your truck.** The 295 is narrower, which helps with clearance against the suspension while giving you almost a full **36" diameter**. One important caveat: **295/60R22 availability is limited**, particularly if you need the appropriate load capacity for a 2500HD. If you want, I can find the **largest actual tire currently made that will fit your factory 22" wheels at stock height**, including Toyo, Nitto, Falken and BFGoodrich, and identify the one with the **largest measured diameter** rather than just calculated size. memcite USER: Please do ASSISTANT: I checked actual available tires and real-world 2024 Sierra 2500HD fitment reports. I’d revise my earlier recommendation slightly. For your **2024 GMC Sierra 2500HD Denali Ultimate, stock suspension, factory 22" wheels**, the largest size I would buy **without planning on a lift** is: ### **LT305/55R22 — about 35.2" × 12.0"** This is the sweet spot. It's nearly an inch taller than your current 285/55R22 while remaining available in proper **Load Range E / 10-ply** HD-truck tires. products{"selections":[["turn0product7","Yokohama Geolandar A/T4 LT305/55R22"],["turn0product1","Goodyear Wrangler Territory A/T LT305/55R22"],["turn0product10","Toyo Open Country A/T III EV LT305/55R22"]]} There's good evidence that the 2024 HD wheel wells can accommodate this general size. A documented stock-suspension 2024 Sierra 2500HD runs **295/65R20 (35.1 × 11.6") with no trimming and no rubbing**. citeturn0search4turn0search6 Interestingly, there's also a 2025 2500HD owner specifically reporting **35×12.50R22 on OEM GMC 22" wheels with the truck completely stock**. citeturn0reddit62 Other 2024/25 HD owners report 35s working stock, although some experience slight rubbing depending on width and wheel offset. citeturn0reddit63 ### Could you go bigger? A **35×12.50R22** is available in several E-rated tires, including the Falken Wildpeak R/T: product["turn0product9","Falken Wildpeak R/T 35×12.50R22 Load E",{"render_as":"hero"}] But here's the interesting part: despite being called a "35," that Falken's listed actual diameter is **34.8"**, so it isn't actually taller than a 305/55R22; it's mainly **wider**. That extra width is exactly what increases your chances of rubbing. Therefore, for what **you** want—maximum tire height while keeping the truck completely stock and retaining your factory 22s—I'd put **LT305/55R22** on it. **Current:** 285/55R22 → ~34.3" × 11.2" **Recommended:** **305/55R22 → ~35.2" × 12.0"** That's about **0.9" more tire diameter** and **0.45" additional ground clearance**, without jumping into a 36" setup that I'd want a level/lift for. If your priority is specifically getting **as close to 36" as physically possible without lifting**, I can dig further into **narrow 35.5–36" tires** (roughly 11–11.7" wide). That's potentially a better route than making the tire wider. memcite --- If you want, I can: - Find narrow 35.5-36 inch tires for stock 2024 Sierra 2500HD - List pros and cons of LT305/55R22 on stock 2024 Sierra 2500HD - Suggest next steps to avoid rubbing with largest stock tires SOURCE B OpenFindings draft: Owner-reported tire fitment on 22x8.5 wheels Status: Selected conversation excerpt; not published; not independently verified. Source: https://chatgpt.com/share/6ae61f2b-0f9c-83ea-b224-15f94dccde09 EDITORIAL NOTE (not original conversation) This excerpt preserves the first four messages of the shared conversation: the owner reports no rubbing, corrects wheel dimensions to 22x8.5, and permits sharing the information. Later discussion of AI memory and unrelated image generation is omitted. The excerpt does not explicitly identify the installed tire size, tire model, wheel offset, suspension configuration, load, steering articulation, or test conditions. It must not be presented as manufacturer approval or a guarantee for other vehicles. The assistant's statement about using this information for other users was subsequently qualified in the omitted AI-memory discussion; no cross-user memory capability is claimed here. ORIGINAL FITMENT EXCERPT USER: The tires worked perfectly with no rubbing. And my wheels are actually 22x8.5 ASSISTANT: Excellent—that confirms the fitment in the real world. I’ll use **22×8.5"** as your actual wheel size going forward, and we now know your current tire setup **fits with zero rubbing**. That’s especially useful as a confirmed baseline if we compare larger tires or suspension changes later. USER: Sounds good. And you can use it if anyone else needs the information ASSISTANT: Absolutely. Your real-world result is useful evidence for the fitment question. I can use the **22×8.5 wheel + your tire size with no rubbing** as an anecdotal data point when helping with similar fitment questions, while making clear that individual trucks can vary.