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Discussion Starter #1 (Edited)
This will be an initial, 10hr, and 40hr review of the GPS Gravity 655 tire in 20x11x9 size. This is for the rear tires only. I'm getting this info out there now so people know and can make an informed decision when buying new tires for their quad whatever model that may be. I noticed there is nothing online as far as reviews or even commotion about this tire or even this brand for that matter.

First I would like to say I am in no way being paid or asked to write this review. I paid for these tires with my own hard earned money. I'm writing this for no monetary value other then to hopefully help and educate my fellow Raptorforum addicts.

A little about my background. I'm 30yrs old. I currently live in Pueblo, CO. I own a '07 Yamaha Raptor 700r, '07 Honda CBR600RR, '12 Subaru Legacy, and a '10 Ford F150 XLT SuperCrew. I do ultrasonic inspection of welds on wind towers for a living. Originally from the Peace Garden state of North Dakota. I grew up in the Red River Valley (flat farm land) where you can watch your dog run away for 4 days. I grew up on snowmobiles, street bikes, and utility quads. Never owned a sport quad until this year. My old man was somewhat of a Tire Guru growing up. He was a manager of Bandag Tire Manufacturing and other tire shops in the early 90s. He instilled in me all his knowledge of tires for off road, cars, and trucks from an early age. So I know a thing or two when it comes to tires.

Now to the good stuff. First I'm gonna ask you what the difference is between a Maxxis Razr2, GBC XC-Masters, SunF A027, and these GPS Gravity 655 tires is? If you said COST you'd be completely right! All of these tires have almost the exact same tread design with completely different price tags. The exception being the GPS Gravity having a slit molded into the lug where the others do not. All of these tires come from overseas. Sad to say it but almost all tires are manufactured overseas. In fact all specialty tires such as these ATV tires are made overseas. And sense we know these companies aren't suing eachother over lug/tread designs that leads me to believe all of these tires are more than likely made by the same company and then branded differently on the sidewall for each vendor. The vendor than decides on a price for each said tire.

Now unfortunately I don't have all 4 tires in front of me to test. So testing the performance between each of these tires will be impossible. And there very well could be definite performance difference between each. The companies might all use the same or similar lug/tread design but that doesn't mean the compound of the rubber is the same. Softer rubber has less durability but much better performance for grip in wet, cold, and even dry conditions. A harder compound delivers less performance in those areas but provide great life and durability over the life of the tire. This is done by usually adding Silica to the compound. It's always a give and take between the two. You can't have amazingly performing tires that last forever it just can't happen.

Initial Review:
Here's what I do know. The GPS Gravity 655 tires are vendored out of Las Vegas, NV by a company you may know, Goldspeed. They too produce their own line of tires as well. The tires were ordered from Ebay (best price) after business hours on Monday. They shipped Tuesday. They arrived Thursday morning. The tires were not deformed in their shipping either. They were shipped bundled together and not distorted or smushed in any way shape or form. They were made this year! All tires have a made on date on the sidewall in a 4 digit code. First 2 numbers are the week it was made with the following 2 numbers displaying the year. Tires go bad and degrade over time even without use or air inflating the tire. 5yrs is usually the good quality lifespan of any kind of tire. They weigh in at 17.6lbs without the rim. That's a difference of 2.2lbs compared to the GBC XC-Masters for the same size tire. Shout out to Morphrider for the weight on the GBC. As you may also know the less weight in your rear wheels the better. Has some scientific thing to do with unsprung mass. The tires are non-directional so they can be rotated for even wear. The lugs have different levels to them making it better for performance as the tire wears over time. The tires are 6ply rated so they're just as durable as the GBC XC-Masters as well. The tires have dedicated Tire Wear Indicators. The tire compound is firm and hard making me believe these tires are built for durability first and performance 2nd. They come with a limited warranty from Goldspeed against any type of manufacturing defects. The best part? I picked both tires up for under $100 shipped to my door within 3 business days from purchase.

10hr Review: After 10hrs of total riding time on hard pack, intermediate, and rocky conditions as well as bits and pieces of dry pavement there are a few things I noticed. My right rear wore faster then my left rear. Which is OK because I can rotate as needed with theses. Some corners of the tread lugs on the outsides of the tires have broken/worn off. That was actually the first thing I noticed after only a few hrs on them. It could be the tires. It could be my riding style (I likes to powerslide). It could be the riding conditions/terrain. Not entirely sure to be honest. It's really not a major concern of mine at the moment but I will be keeping a close eye. It's not like entire tire lugs came flying off or anything. So far no punctures or leaks which is good. I've been running mine at 5 to 6psi. So far I'm still happy with my $94 purchase.

40hr Review: TBD

Where to get them?
PM me for discount offer code
https://www.gpsoffroadproducts.com/shop/gps-gravity655-tire/
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/132764880418
 

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Great job in getting this together, this will be some valuable information to all. I have always seen their ads in Ebay with scantily clad women (sex sells and we all know that) so I was always under the assumption that this brand of tire was just after that ad campaign to get sales. And it still might be, we won't really know until we get more information from Raptordaddy concerning this. Definitely appreciate your time and effort in doing this testing. I will make this a sticky in the dedicated sub-forum so it is easy for you to get to and easy for everyone to access in the future of our sport.
 
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Discussion Starter #3
Great job in getting this together, this will be some valuable information to all. I have always seen their ads in Ebay with scantily clad women (sex sells and we all know that) so I was always under the assumption that this brand of tire was just after that ad campaign to get sales. And it still might be, we won't really know until we get more information from Raptordaddy concerning this. Definitely appreciate your time and effort in doing this testing. I will make this a sticky in the dedicated sub-forum so it is easy for you to get to and easy for everyone to access in the future of our sport.
Thanks Morph and it's my pleasure. Just got them mounted up today. 10hr Review will be incoming in the next couple of weeks. After digging deeper into the tires written on the bead is "manufactured in China". The side wall stiffness is unbelievable and the STI Tech 4 XC tires I pulled off don't even compared to the rigidity of these GPS Gravity 655s. The STI Tech 4 XCs were manufactured in Thailand if anyone is wondering.
 

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I do like the side walls on those GPS
 

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Discussion Starter #10
Thanks man for taking the time to compile that info....I run the XC masters and didn't realize they are heavier till you mentioned it.
Not a problem. Big thanks to Morphrider for giving me the weight on the GBC XC Masters. But yes there's 4.4lbs less unsprung weight for the Raptor to rip thanks to these tires. Can anyone tell me about how many hours/miles you can expect a set of GBC XC Masters to last?
 

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That is a ton of weight in a very crucial area. I was planning on buying the gbc when i need tires, but maybe i will give these a shot...

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Too late for me, mine are brand new and just mounted.....ill be fine though for trails etc, not jumping or racing
 

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Not a problem. Big thanks to Morphrider for giving me the weight on the GBC XC Masters. But yes there's 4.4lbs less unsprung weight for the Raptor to rip thanks to these tires. Can anyone tell me about how many hours/miles you can expect a set of GBC XC Masters to last?
I have a full season of racing on mine. The fronts look like new, the rears are showing signs of slight wear and I have been on a couple really nasty races. I am thinking I will get one more season on the rears.
 

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I have a full season of racing on mine. The fronts look like new, the rears are showing signs of slight wear and I have been on a couple really nasty races. I am thinking I will get one more season on the rears.
Slight signs of wear and you think only 1 more season ?
 

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I have a full season of racing on mine. The fronts look like new, the rears are showing signs of slight wear and I have been on a couple really nasty races. I am thinking I will get one more season on the rears.
Slight signs of wear and you think only 1 more season ?
Certainly an estimate, but I am not going to race on half worn tires. I was shocked they are not worse than they are due to the crap I put them through, and doing that all over again seems like it may be enough. I am new so I am just estimating this.
 

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Certainly an estimate, but I am not going to race on half worn tires. I was shocked they are not worse than they are due to the crap I put them through, and doing that all over again seems like it may be enough. I am new so I am just estimating this.
have you been cutting them to keep the edges sharp?
 

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Certainly an estimate, but I am not going to race on half worn tires. I was shocked they are not worse than they are due to the crap I put them through, and doing that all over again seems like it may be enough. I am new so I am just estimating this.
have you been cutting them to keep the edges sharp?
No, I am not familiar with that. If I get a chance tonight, I will take a picture and lug measurement so you can judge for yourself. I have really like these tires and will buy them again.
 

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Certainly an estimate, but I am not going to race on half worn tires. I was shocked they are not worse than they are due to the crap I put them through, and doing that all over again seems like it may be enough. I am new so I am just estimating this.
I gotcha.....what does your race season schedule consist of so I have an idea of how long mine will last with the occasional trail ride
 

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I gotcha.....what does your race season schedule consist of so I have an idea of how long mine will last with the occasional trail ride
My season starts late February and ends mid November. So here are a couple of pictures of my rear tires, still looking pretty good think. I measured the tread depth in a few places and it is 5/8 inch. GBC site says new tires are 15/32nds. So by my math, I have added 2/32nds to my tire!! :grin If they don't get chewed up they very well could last a few seasons. I am going to stick with them although I may move the to the Ground Busters in the rear as they have split lugs. I wanted those in the first place but they were new and unavailable. Certainly a good tire for sure, lots of folks run these.

Are you going to race X-Country/Hare scramble races? If so, which district or series? I mainly race the District 17 series in Illinois, but on off weekends I do IXCR, MWXC, and GNCC races when I can. Good luck to you.
 

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