I finally managed to complete the combination that I had been asked to make, and... Wow. I tested it against both Flame Saggitario C145S and Flame Libra T125ES, and the results may surprise you.

NOTE: These tests took place on the BB-41 Super Attack Beystadium, so the results may be different on the BB-10s everyone uses.

TRIAL 1: VS. FLAME SAGGITARIO C145S
20 Rounds
Round 1: Grand Bull 145SD O.S.
Round 2: Grand Bull 145SD O.S.
Round 3: Grand Bull 145SD O.S.
Round 4: Grand Bull 145SD K.O.
Round 5: Grand Bull 145SD O.S.
Round 6: Grand Bull 145SD O.S.
Round 7: Grand Bull 145SD O.S.
Round 8: Grand Bull 145SD O.S.
Round 9: Grand Bull 145SD O.S.
Round 10: Grand Bull 145SD O.S.
Round 11: Grand Bull 145SD O.S.
Round 12: Grand Bull 145SD O.S.
Round 13: Grand Bull 145SD O.S.
Round 14: Grand Bull 145SD O.S.
Round 15: Grand Bull 145SD O.S.
Round 16: Grand Bull 145SD O.S.
Round 17: Grand Bull 145SD O.S.
Round 18: Grand Bull 145SD O.S.
Round 19: Grand Bull 145SD O.S.
Round 20: Grand Bull 145SD O.S.

Quite a record, eh? Let's see how it does in...

TRIAL 2: VS. FLAME LIBRA T125ES
Round 1: Grand Bull 145SD O.S.
Round 2: Grand Bull 145SD O.S.
Round 3: Grand Bull 145SD O.S.
Round 4: Grand Bull 145SD O.S.
Round 5: Grand Bull 145SD O.S.
Round 6: Grand Bull 145SD O.S.
Round 7: Grand Bull 145SD O.S.
Round 8: Grand Bull 145SD O.S.
Round 9: Grand Bull 145SD O.S.
Round 10: Grand Bull 145SD O.S.
Round 11: Grand Bull 145SD O.S.
Round 12: Grand Bull 145SD O.S.
Round 13: Grand Bull 145SD O.S.
Round 14: Flame Libra T125ES K.O. (Hit the other blade on the way down, knocked it out)
Round 15: Grand Bull 145SD O.S.
Round 16: Grand Bull 145SD O.S.
Round 17: Grand Bull 145SD O.S.
Round 18: Grand Bull 145SD O.S.
Round 19: Grand Bull 145SD O.S.
Round 20: Grand Bull 145SD O.S.

As you can see, This combo works exceptionally, having 39 out of 40 wins against other Stamina types, 38 of those 39 being outspins. The excellent thing about Grand is that it is a long enough wheel that it deflected the C145 track easily when the two came in contact. When I soloed Grand Bull and timed it, it spun for a good 5 and a half minutes. Grand Bull 145SD is an excellent choice as a blade, and sure to be a top-tier choice in the future.

(Note: The SD tip in this test was never used before this. Worn tips may, and probably will, give you different results occasionally, but generally, you shouldn't have a difficult time.

Use top-tier combos, not just beys out of the boxes. It proves nothing. Also, use BB-10, since it's more balanced.

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Orange Juice > Lemonade > Apple Juice > Grape Juice

I' have to say since it's stamina testing any stadium works. You need to test it against Virgo 145SD or Flame/Burn/Thermal/ Earth [mold 1] 145SD

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‎??? <Pyro.

2 problems.

1. I don't have access to quite a few of the parts needed to make the top-tier stamina combos. I'm working on getting a Burn Phoenix and a Virgo, but I lack the funds at this time.

2. Every BB-10 is as expensive as heck. It's nearly impossible to find one under $75.

I did my best with the materials I had available. However, you really shouldn't overlook this combo.

You can get a korean BB-10 on gmarket. It's really cheap and korean, so it's real. Also, you could just wait for the beys you need to come out.

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Orange Juice > Lemonade > Apple Juice > Grape Juice

I've tried searching on gmarket, but I haven't found one. I am waiting for the beys to come out, but it takes a while.

or BB-32 from dimsum2u

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‎??? <Pyro.

You need to searh "Beyblade Stadium" in korean

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Orange Juice > Lemonade > Apple Juice > Grape Juice

Either way, I still lack the funds to buy it, though.
Anyway, enough of the issues with my income. What about the combo?

We cannot really say anything about this combination, because the results you gave do not reveal anything interesting. It would take somebody else to conduct real tests against top-tier customizations.

Actually, Kei did some tests with a similar combination, Grand Aquario DF145B, against a good Stamina Beyblade, and this customizations is very bad.
http://worldbeyblade.org/Thread-Grand-Discussion

OK. Actually, though let me edit the post to show what the combo actually did.