推荐回答（5个）
捷安特公路车16速和18速的区别如下：
1、尺寸不同。
捷安特16速的尺寸是700X465MM/700X500MM；而捷安特18速的尺寸是700CX465MM/700CX500MM/700CX535MM。
2、车架不同。
捷安特16速的车架是GIANT铝合金车架；而捷安特18速的车架是GIANT铝合金超轻星公路车车架（6011S）。
3、变速系统不同。
捷安特16速的变速把手是SHIMANO CLARIS16速，前变速器是SHIMANOFD-2400 ，后变速器是SHIMANORD-2400；捷安特18速用的是碳纤维前叉变速系统SHIMANO TIAGRA加上变速系统18S刹车系统SHIMANO TIAGRA。
4、轮胎不同。
捷安特16速用的轮胎是GIANT700X25C轮胎，捷安特18速用的是XERO公路车轮组。
18速比16速多两个档位可选，速越多变档越细腻，可选齿比越多。
一、新款捷安特16速
捷安特OCR5500配置介绍
全新设置内走线
尺寸：700465MM,500MM
车架：GIANT铝合金车架
前叉：GIANT铝合金前叉
车把：铝合金车把
变速把手：SHIMANO CLARIS16速
前变速器：SHIMANO FD-2400
后变速器：SHIMANO R D -2400
飞轮：SHIMANO CS-HG50
刹车：铝合金公路车夹器
大齿盘：SHIMANO FC-A070 50X34T
轮胎:GIANT700X25C轮胎
二、新款捷安特18
速基本配置：尺寸:700CX465MM/700CX500MM/700CX535MM
车架:GIANT 铝合金超轻量公路车车架(6011S)
前叉:GIANT
碳纤维前叉变速系统:SHIMANO TIAGRA
变速系统18S刹车系统:SHIMANO TIAGRA
刹车系统轮胎:MAXXIS 700X23C 60TPI
轮胎圈:XERO公路车轮组
其他:SHIMANO TIAGRA齿盘,TWINS铝合金公路把，TWINS 3D锻造竖杆，超吸汗止滑绑带, Jagwire刹车线和变速线外壳, 轻量化底壳座垫，整车重量：约9.1 kg （700CX500MM不含脚踏的重量）
捷安特自行车，是是全球自行车生产及行销最具规模的公司之一，其网络横跨五大洲，五十余个国家，公司遍布中国大陆、美国、英国、德国、法国、日本、加拿大、荷兰等地，掌握着超过1万个销售通路。
捷安特以30多年生产各类自行车的专业经验，将先进的生产技术、管理模式以及行销全球的成功理念，精心打造每一个零部件，并使得每一个消费者都能够感受到我们的人性服务。
18速比16速多两个档位可选，速越多变档越细腻，可选齿比越多。这个和速度关系不大，速度快慢主要看重量、最大齿比、滚阻、风阻。
公路车牙盘一般是2个，飞轮如果是8片的，就是2X8 16速， 飞轮是9片的，可以变速的选择就是2X9 18速。 相应的前拨和指拨需要更换，链条有些能兼容，有些不行。。使用上就是变速细腻些，另外9速的比8速质量当然好一些，骑起来感觉舒服些。
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