Front end shaking my teeth out when I brake

**JJam** · 11-05-2007, 05:57 PM

I just bought some 20" Momo wheels and they have toyo 305/50R20 tires. I bought them used I took them and had them balanced just in case. When I brake the front end shakes bad, the stock wheels were fine. I have a 06 Silverado crew cab if it makes a dif. Are the tires too big/wide?

**Crawdaddy** · 11-05-2007, 06:10 PM

The rotors could be warped. I would think that if you put larger tires on, the larger mass could make it more noticable.

**JJam** · 11-05-2007, 06:40 PM

on a new truck, the stock wheel had/showed no problems?? if so I'll take it back to the dealer. I only have $600 in the wheels

**unplugged** · 11-05-2007, 08:32 PM

Increasing the tire diameter by more than 3% is dangerous because it overloads the brakes and can cause brake failure. Just because everyone does it, doesn't make it right. As you can see by the comparison chart, you at over the safe limit as far as tire size.

From: 1010tires.com

Stock Tire - 245/70R17..................... .....Tire 1 - 305/50R20
Section Width:9.64 in245 mm...........Section Width:12.00 in305 mmRim
Diameter:17 in431.8 mmRim.............Diameter:20 in508 mmRim
Width Range:6.5 - 8 inRim.................Width Range:8.5 - 11 in
Overall Diameter:30.50 in774.7 mm....Overall Diameter:32.00 in812.8 mm
Sidewall Height:6.75 in171.45 mm......Sidewall Height:6.00 in152.4 mm
Radius:15.25 in387.35 mm..................Radius:16.00 in406.4 mm
Circumference:95.81 in2433.5 mm...........Circumference:100.5 in2552.7 mm
Revs per Mile:681.9..............................Revs per Mile:650
Actual Speed:60 mph........................100 km/h
Speedometer1:57.1 mph....................95.3 km/h
Speedometer Difference: -.....................Speedometer Difference: 4.907% too slow
Diameter Difference: -Diameter Difference: 4.69%

**JJam** · 11-05-2007, 10:31 PM

So should I go with 275/60-20, stock size option on the new silverado's? And will this fix my problem? I don't want to buy new tires and find out it was not the tires at all.

**unplugged** · 11-06-2007, 07:21 PM

I don't think I can accurately diagnose your problem all the way from the Mojave Desert. I am just trying to help you find the solution to your particular problem. Do you have the original wheels and tires that you can put back on to test with?

**JJam** · 11-06-2007, 08:38 PM

Just put the stock wheels back on the truck, I'll take it to work 2morrow and let you know the outcome.

**TahoeFever** · 11-06-2007, 10:37 PM

bigger wheels means upgrading the brake system also

**dwill3015** · 11-06-2007, 11:25 PM

Is your 06 Crew Cab a 1500, or a 2500? I run the same size on my 06 2500HD with no probs at all. I have 305/50/R20 Toyo Open Country A/T's on Ultra wheels.

I have a much easier time braking with my truck that my Wife does with the same tires only in 18" on her 1500 Suburban because of the brake size difference.

**JJam** · 11-07-2007, 05:59 PM

well went to work and no braking problems, no shake. So when you get 20" from the dealer they are not upgrading the brakes. So I'm thinking with the 20" rims you need to run the smaller tires, which is what they have on the stock 20" rims (275/60-20 tires with a rim 20x8.5) Thanks everyone with this problem, hope it will help others.