 Lemon, former Chief Engineer at Ace, who was employed by Indian when they bought Ace.The Ace's leading-link forks and central coil spring were replaced by Indian's trailing-link forks and quarter-elliptic leaf spring.By 1929, the Indian 402 would have a stronger twin-downtube frame based on that of the 101 Scout and a sturdier five-bearing crankshaft than the Ace, which had a three-bearing crankshaft.