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Speedwagon was helping Zeppeli so he could use his ripple to save Jonathan. They needed to do it asap since Jonathan was about to get attacked, so that's why Speedwagon went for the abs approach as Zeppeli's arm was completely frozen and with no blood flow at all. Speedwagon seems to be gay though, however he's gay for Jonathan. There have been mentions throughout different Jojo media about him falling in love with Jonathan.
I never really thought about it before but looking back it actually makes a lot of sense considering he’s risking his life for him for no reason other than him being a “true gentleman”. however based on what I’ve seen (I’ve completed episodes 1-6) Jonathan is practically confirmed to be heterosexual, making Speedwagon’s story much more tragic. Because instead of being like a typical shonen anime where he’s going on this dangerous quest purely out of friendship, he is doing this out of love. And maybe it’s just my propensity towards angsty ships but maybe he’s also doing this in hopes that Jonathan will love him too, unaware that Jonathan will never love him the way he does.