Offered in white and black and a variety of lengths and offsets, the mast cap includes hardware compatible with round saddle rails only. 7x10mm carbon rail-compatible hardware sold separately.
Product details
- Ultra-light carbon construction
- Direct fit on all Trek road bikes with round seat masts
- Color matched for direct compatibility
- One bolt head design offers easy fore-aft and infinite angle adjustment
- Includes 7mm round saddle clamp ears, 10mm ears sold separately
if (typeof dataLayer !== "undefined") {
dataLayer.push({
"ecommerce": {
"currency": "USD",
"impressions": [
{
"id": "22689",
"name": "Bontrager Line Elite Dropper Seatpost",
"price": "349.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "black",
"list": "More Options",
"position": 1
}
,
{
"id": "24159",
"name": "Bontrager Line Dropper Seatpost",
"price": "249.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "black",
"list": "More Options",
"position": 2
}
,
{
"id": "30227",
"name": "Bontrager XXX 31.6 2-Bolt Seatpost",
"price": "199.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "greydark",
"list": "More Options",
"position": 3
}
,
{
"id": "24161",
"name": "Bontrager Pro Seatpost",
"price": "109.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "black",
"list": "More Options",
"position": 4
}
,
{
"id": "11849",
"name": "Bontrager Elite Seatpost",
"price": "59.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "black",
"list": "More Options",
"position": 5
}
,
{
"id": "13373",
"name": "Bontrager Comp Seatpost",
"price": "24.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "black",
"list": "More Options",
"position": 6
}
,
{
"id": "24997",
"name": "Trek Madone SLR Color-Matched Carbon Internal Seat Mast Cap",
"price": "274.99",
"brand": "Trek",
"category": "Bike stems & seatposts",
"variant": "orange",
"list": "More Options",
"position": 7
}
,
{
"id": "30477",
"name": "Trek Madone SL Color-Matched Carbon Internal Seat Mast Cap",
"price": "274.99",
"brand": "Trek",
"category": "Bike stems & seatposts",
"variant": "blue",
"list": "More Options",
"position": 8
}
,
{
"id": "30668",
"name": "Trek Domane SLR Color-Matched Carbon Internal Seat Mast Cap",
"price": "274.99",
"brand": "Trek",
"category": "Bike stems & seatposts",
"variant": "red",
"list": "More Options",
"position": 9
}
,
{
"id": "33924",
"name": "Trek Domane SL Color-Matched Carbon Internal Seat Mast Cap",
"price": "274.99",
"brand": "Trek",
"category": "Bike stems & seatposts",
"variant": "black_greydark",
"list": "More Options",
"position": 10
}
,
{
"id": "13662",
"name": "Trek Madone Micro-adjust Aero Carbon Seatpost",
"price": "219.99",
"brand": "Trek",
"category": "Bike stems & seatposts",
"variant": "black",
"list": "More Options",
"position": 11
}
,
{
"id": "11879",
"name": "Bontrager Speed Concept Carbon Seatpost",
"price": "199.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "greydark",
"list": "More Options",
"position": 12
}
,
{
"id": "29007",
"name": "Bontrager Speed Concept UCI-legal (Gen 1) Seatpost",
"price": "199.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "greydark",
"list": "More Options",
"position": 13
}
,
{
"id": "31579",
"name": "Bontrager XXX 27.2 Seatpost",
"price": "199.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "greydark",
"list": "More Options",
"position": 14
}
,
{
"id": "21988",
"name": "TranzX JD-YSP15 Dropper Seatpost",
"price": "169.99",
"brand": "TranzX",
"category": "Bike stems & seatposts",
"variant": "black",
"list": "More Options",
"position": 15
}
,
{
"id": "34015",
"name": "Trek Color-Matched Matte Carbon Seat Mast Cap & 7mm Round Ears",
"price": "159.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "grey",
"list": "More Options",
"position": 16
}
,
{
"id": "12559",
"name": "Bontrager XXX 31.6 Seatpost",
"price": "149.99",
"brand": "Bontrager",
"category": "Bike stems & seatposts",
"variant": "greydark",
"list": "More Options",
"position": 17
}
,
{
"id": "31127",
"name": "Bontrager Pro Factory Overstock Seatpost",
"price": "60.0",
"brand": "Bontrager",
"category": "Factory overstock",
"variant": "black",
"list": "More Options",
"position": 18
}
,
{
"id": "24634",
"name": "Trek Round Factory Overstock Carbon Seat Mast Cap",
"price": "56.0",
"brand": "Bontrager",
"category": "Factory overstock",
"variant": "white",
"list": "More Options",
"position": 19
}
,
{
"id": "10885",
"name": "Trek Pavement Suspension Seatpost",
"price": "24.99",
"brand": "Lee Chi",
"category": "Bike stems & seatposts",
"variant": "greylight",
"list": "More Options",
"position": 20
}
,
{
"id": "12827",
"name": "Electra Replacement Seatpost",
"price": "3.99",
"brand": "Lee Chi",
"category": "Bike stems & seatposts",
"variant": "greylight",
"list": "More Options",
"position": 21
}
]
}
});
}
If for any reason you're not satisfied with a Bontrager aftermarket purchase, return the item, along with the original sales receipt to the original place of purchase within 30 days for an exchange or refund. Think of it as a 30-day test ride.
Learn more
if (typeof dataLayer !== "undefined") {
dataLayer.push({
"ecommerce": {
"currency": "",
"impressions": [
{
"id": "21764",
"name": "Bontrager Circuit MIPS Cycling Helmet",
"price": "",
"brand": "Bontrager",
"category": "Bike helmets",
"list": "",
"position": 1
}
,
{
"id": "25362",
"name": "Bontrager Specter WaveCel Cycling Helmet",
"price": "",
"brand": "Bontrager",
"category": "Bike helmets",
"list": "",
"position": 2
}
,
{
"id": "14009",
"name": "Bontrager Montrose Elite Bike Saddle",
"price": "",
"brand": "Bontrager",
"category": "Bike saddles",
"list": "",
"position": 3
}
,
{
"id": "06096",
"name": "Bontrager Rotary Head Seatpost Saddle Clamp Ears",
"price": "",
"brand": "Bontrager",
"category": "Bike frame parts",
"list": "",
"position": 4
}
,
{
"id": "13692",
"name": "Bontrager Ajna Elite Bike Saddle",
"price": "",
"brand": "Bontrager",
"category": "Bike saddles",
"list": "",
"position": 5
}
,
{
"id": "27094",
"name": "Bontrager Aeolus Elite Bike Saddle",
"price": "",
"brand": "Bontrager",
"category": "Bike saddles",
"list": "",
"position": 6
}
,
{
"id": "21515",
"name": "Bontrager Arvada Elite Bike Saddle",
"price": "",
"brand": "Bontrager",
"category": "Bike saddles",
"list": "",
"position": 7
}
,
{
"id": "23999",
"name": "Bontrager Flare RT Rear Bike Light",
"price": "",
"brand": "Bontrager",
"category": "Bike lights",
"list": "",
"position": 8
}
]
}
});
}
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Weights are based off Trek pre-production products at time of publication. Weights may vary in final production.
