想請教tarmac sport 零件升級的方向

各位大大好
小弟最近入手了15年的tarmac sport
跟小弟先前騎過的白牌車相比
實在有著天壤之別
整車應該不算輕 大概8.9KG(還是8.9算很輕??)
由於小弟剛入坑不久
知識方面較為不足
像是原廠的輪組我姑狗了半天都沒看到資料...
因此想請教各位
如果想升級零件時
大家會先考慮的部分
下面是車子的配置清單

車架
Specialized FACT 9r carbon, FACT construction, compact race design, 1-3/8" lower bearing, OSBB
前叉
Specialized FACT carbon, monocoque, OS race for 1-3/8" bearing
頭碗組
1-1/8" upper, 1-3/8" lower, integrated Cr-Mo cartridge bearings, 20mm cone spacer, w/ 20mm of spacers
龍頭
Specialized Comp Multi, 3D forged alloy, 4-bolt, 12-degree rise
把手
Specialized Comp, shallow drop, alloy, 125mm drop, 70mm reach
把手帶
Specialized Classic, w/ gel
前煞車器
AXIS 1.0
後煞車器
AXIS 1.0
前變速器
Shimano 105
後變速器
Shimano 105, 11-speed
變速把手
Shimano 105 STI, 11-speed
飛輪
Shimano 105, 11-speed, 11-28
鏈條
Shimano 105, 11-speed
大盤
FSA Gossamer, BB30, 52/36
踏板
Nylon flat test ride, loose-ball, w/ reflectors
前輪
AXIS 2.0
後輪
AXIS 2.0
前外胎
Specialized Turbo Pro, 127TPI, folding bead, BlackBelt protection, 700x25c
後外胎
Specialized Turbo Pro, 127TPI, folding bead, BlackBelt protection, 700x25c
內胎
Standard, presta valve
座墊
Body Geometry Toupé Comp Gel, hollow Cr-Mo rails, 143mm
座管
Specialized Comp, FACT carbon, 27.2mm
座管束
Alloy, 32.6mm