Accelerated development of cross-coastal access to southern eastern Java, known as the South Coast Cross Lane (JLS) very dependent with the topography of the southern region of Java island, about 65% of JLS are in mountainous and coastal areas. One of them is the construction of Dimoro Bridge in Malang East Java region with simple composite girder type spans 20.00 meters. According to basic design, girder dimensions use IWF. 980 x 350 x 10 x 35, with the number of girder n = 7 and the girder length 20.40 m. The issue of girder dimensions IWF. 980 x 350 x 10 x 35 is not mass-produced by the steel industry, so there needs to be a design review with the dimensions of girder in the steel industry market with IWF. 800 x 300 x 14 x 26. The analysis of dimensional changes and the number of simple composite girder is reviewed from : (1) the height of the girder profile approaching plan (d), because when the smallest (d) value is taken there will be more number of girder (n) installed. (2) the weight of the bridge structural steel approaching plan (Wr), since if Wr' < Wr means fulfilled by not changing the calculation of the bridge foundation, if Wr' > Wr then it is necessary to recalculate the strength of the bridge foundation. Analyze results for bending moments on IWF girder. 800 x 300 x 14 x 26 is obtained : M precomposite = 43850 kg.cm, M post-composite = 13816200 kg.cm. The moment of resistance (wb) due to Mpre and Mpost = 5003 cm3. Moment of inertia (Ix) = 282554 cm4 (table Ix = 292000 cm4). The moment of resistance (wx) = 7064 cm3 (table wx = 7290 cm3). Control of ultimate stress σau* = 2780 kg/cm2 is obtained Mmax = 12030000 kg.cm, σa' = Mmax/wx = 2405 kg/cm2 > σa = 1850 kg/cm2, the stress σa' exceeds the permit stress σa but still below ultimate stress σau* (safe). Control of deflection, for L/250 obtained Ix = 157733 cm4 < Ix plan = 282554 cm4 (safe). For L/360 obtained Ix = 201819 cm4 < Ix plan = 282554 cm4 (safe). Control of the shear stress obtained T = 229.76 kg.cm2