1/8 Buggy Tire/Wheel weight?

What's your buggy??
I'm to convert my Hyper 7 pro, and with the 1515 motor, the FP 5000, 4s pack and MGM 16018, i'am to 8.6 lbs.
It's a prety heavy buggy. I would want to have an MBX5R, but don't have $$$ for this now.

But 8.6 lbs is lighter than my mugen truggy at 11 lbs

my buggy is a mp777 sp2 with a novak HV4.5 motor, 2 aluminum battery trays and (the biggest weight issue) 2 2s 10,000mAh lipo batteries.
I decided to go with the huge batteries to ensure I could survive the 15-20min A-mains at the local nitro track, as well as bash for ever. Although going with say a 5000mAh battery would have cut .8lbs off of the weight of the buggy, I didn't know for sure if it would give me enough runtime. (On occasion, if someone needs to leave by a certain time I have seen them run the race right after that classes 2nd qualifying, which would add 5 minutes onto run time.
Cost effectively, if I refuse to cut down on the batteries the wheels (if I can find something a little lighter then those 0.86lb wheels that aren't to expensive) are one of the few things left for me to cut down on, other then maybe remaking my battery trays from UHMWPE or derlin. Or changing motor/esc as the novak system is heavy.
I do need to run the buggy more, once I rebuild the diff to see if my motor thermaling was a fluke (I was running in grass) or if it will actually keep happening as thermaling is just as bad as dead batteries in a race...

I could try to put another fan or two on the motor... or maybe buy novak's new fan mount thing as I am pretty sure it would save weight
Here is a pic of my buggy, other pics are on my "mp777 sp2 brushless" thread

If anyone has tires, rims, foam insterts laying around I would be interested to know what they weight individually.

I can see that you have an Ofna Spyder diff on the center, the same one that i've in my H7.
Could you tell me what oil weight have you put in this diff, and how you fill it??

I realy don't know how to fill this type of diff and should i put thread lock on the 6 screw??

thank you

Originally Posted by david lamontagn

I can see that you have an Ofna Spyder diff on the center, the same one that i've in my H7.
Could you tell me what oil weight have you put in this diff, and how you fill it??

I realy don't know how to fill this type of diff and should i put thread lock on the 6 screw??

thank you

I really don't have to much experience with it. I have 10k fluid in there, seems to work ok although I notice that in grass if I am light on the trigger the diff will spin without the tires moving. (maybe I need to be harder on the throttle, maybe I need heavier weight diff fluid, I don't know).
As for filling...
The best way I could figure out is install all 6 screws (as usual, put em all in a little loose then tighten in a pattern like car lug nuts. Once they are all tight, I then unscrew one and put in the diff fluid from that whole. Since I am using 10k, it is thick enough that it doesn't leak out to much from the other side.
As for the thread lock, that would probably be a good idea. My suggestion for that would be to put a little on the threaded end of the diff (in the threads) and then insert the screws and tighten. Of course if you are using my previously mentioned method of putting diff fluid in you would only want to initially put thread lock on 5 of the screws, tighten all 6, then remove the non thread locked, pour in diff fluid, insert the screw almost all of the way (pushed fully in, but not threaded, wipe off any diff fluid that came out, put some thread lock on the threads, and screw it in.

I purchased a used tire lot off ebay so I have some more tire info:

Weight-0.98b(443.7g)
Number of tires- 4
Tire brand-Werks
model-"W's"
Rim brand-unknown
Type (type=dish/spoke, ect)-spoke
Rubber-medium compound
Condition-used

Weight-0.94b(427.6g)
Number of tires- 4
Tire brand-GRP
model-"Atomic"
Rim brand-GRP
Type (type=dish/spoke, ect)-12 spoke
Rubber-unknown
Condition-used

Weight-1.03b(466.1g)
Number of tires- 4
Tire brand-Pro-line
model-"Bow-Tie"
Rim brand-Proline
Type (type=dish/spoke, ect)-dish
Rubber-unkown
Condition-used

Weight-1.17b(533.0g)
Number of tires- 4
Tire brand-Pro-line
model-"Mugshot"
Rim brand-Proline
Type (type=dish/spoke, ect)-dish
Rubber-unkown
Condition-used

I did notice the my off brand rims look thicker (heavier) then the brand name rims. I would be willing to guess that most of my weight difference in the tires is coming from the rims.