Thursday, April 22, 2010

Tire Sizes

Every day there are questions regarding what different tire sizes are safe to run. The rule of thumb for the TSX is that the VSA and ABS will not be affected if the new tire size is within +/-2% of the stock circumference. This can be confusing for those that aren't math savvy so I put together a simple spreadsheet to do the calculations. The stock size is 215/50-17 but since this is a spreadsheet, it is not TSX specific and therefore you can use it for whatever car you have by changing the stock size cells. What the spreadsheet won't tell you is whether or not the tire size you wish to run on your wheels will actually work. For instance, the '04-'08 TSX factory wheels are 7" wide. The maximum tire width you can run is 225mm and even then, they may be very difficult to seat. After I bought my TSX, I decided I wanted a slightly wider and lower profile tire so I went with a 225/45-17. The circumference is 1.9% smaller than stock. A better match would be a 235/45-17 but 235mm is too wide for the stock 7" wheel. Get my point?

I found this spreadsheet to be particularly useful when sizing up/down wheels for summer/winter specific tires. For instance, a winter tire is best on a 16" wheel, so what size tire do I need to buy? Consult the spreadsheet!

The spreadsheet can be downloaded here.

Update: I picked up a set of 2005 Accord V6 Sedan (16") wheels for a great price. I tossed some Acura center caps on them and they look great. They're going to be a perfect winter setup. I threw them on the front and verified that they clear the brakes etc. It's pretty tight but they fit and will work on the TSX with no issues.






Friday, April 9, 2010

Rotora: Why to NEVER buy.

Buying a product that meets your expectations is enough for some people to give a company a good review. The fact of the matter is, when you buy a product that "works" out-of-the box, you never actually get to deal with the manufacturer. Recently, I purchased a set of front and rear slotted rotors for my '05 TSX. My experience has opened my eyes, not only to an inferior product, but also to a backwards management style that ensures failure.

Upon receipt of the rotors, they were visually flawless. I took note of their short warranty (2wk/500mile) and was immediately questioning the quality of the product. Installation went smoothly; the rotors met OE design specifications exactly. I didn't even make it down the driveway before I noticed MAJOR pedal pulsation. Pressing the brake pedal while at speeds of 50mph or higher resulted in violent steering shudders and surging. After thorough inspection, I determined that BOTH the front rotors were out of spec. The rears were flawless.

The distributor (Excelerate Performance) told me I would have to submit a warranty claim with Rotora. In another blog entry, I will address this issue. I was immediately displeased with Rotora's (lack of) customer service. An hour and a half after they were supposed to be open, a customer service rep finally answers the phone. After explaining the situation, his response was "our rotors leave the facility flawless, you installed them improperly." After articulating to the rep why he was incorrect, his next response was "it must be your hubs, try replacing those." Being a (PhD candidate) engineer, I called him out on his lack of knowledge. His final response was to call back later when a tech would be in, but he wasn't sure when that was.

I finally got a hold of a tech and he seemed much more helpful. I suggested he ship me a new front set and I'd send the defective ones back. A day later I get a response "management wants to verify they are defective before they send out any product." Now, this I can understand when they are standing to lose thousands over a false warranty claim for a BBK but for $200 rotors? After a week of arguing, they agreed to charge my credit card for the product and refund me once they receive mine. I responded telling them to invoice me (for legal reasons). Three days passed and no invoice was received. I received a call saying that they were no longer going to work this matter out and no matter what, I needed to send the defective product to them for their verification.

I ended up buying new Duralast rotors from Autozone for less than half the price and a 2yr unlimited mile full replacement warranty. After installing these, I haven't had the slightest hint of surging, pulsation, or vibration. These rotors are smooth as butter. I submitted a chargeback claim to my CC and will receive my money back shortly.

In short, Rotora is so arrogant that they are unwilling to accept that their product is susceptible to manufacturing defects. They put 100% of the cost and blame back on the customer and are unwilling to honor their otherwise vague "warranty". I have heard other stories of the exact same problem and after others' sent their rotors in, Rotora claimed they were in spec and wouldn't send out new parts. The practice of putting all fault on the customer will bring your company to its knees, once the public becomes informed of your practices. They are willing to kill their relationship with a customer over a few hundred dollars. In my opinion, they are a total scam and should be completely avoided. If their products were truly superior, they would have a warranty that reflects that belief.

Save your money, NEVER BUY ROTORA.