Run your favorite 31.8mm clamping diameter handlebar on a bike with Knock Block with the Rhythm Comp 31.8. It adds Knock Block compatibility to a durable stem with multiple lengths to let you fine-tune the fit to your ride.
Product details
- Get 31.8mm handlebar compatibility with your Knock Block system
- Also compatible with standard headsets and spacers
- Knock Block system protects frame from impacts by fork and handlebars by eliminating over-rotation of bars
- Available in a wide range of sizes for today's mountain rider
- See Service Parts for other Knock Block parts
- Approved for carbon bars and steerer tubes
if (typeof dataLayer !== "undefined") {
dataLayer.push({
"ecommerce": {
"currency": "USD",
"impressions": [
{
"id": "34937",
"name": "Bontrager RSL Blendr Stem",
"price": "288.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 1
}
,
{
"id": "23234",
"name": "Bontrager Pro Blendr Stem",
"price": "120.99",
"brand": "Bontrager",
"category": "Blendr integration",
"variant": "black",
"list": "More Options",
"position": 2
}
,
{
"id": "33106",
"name": "Bontrager Line Pro 35 0 Degree Blendr Stem",
"price": "120.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 3
}
,
{
"id": "36213",
"name": "Bontrager Kovee Pro 35 Blendr Stem",
"price": "120.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 4
}
,
{
"id": "31465",
"name": "Bontrager Elite Stem",
"price": "67.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 5
}
,
{
"id": "35468",
"name": "Bontrager Blendr Adjustable Integrated Stem",
"price": "63.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 6
}
,
{
"id": "24156",
"name": "Bontrager Line 35 0 Degree Stem",
"price": "41.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 7
}
,
{
"id": "35132",
"name": "Bontrager Elite 35 Stem",
"price": "41.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 8
}
,
{
"id": "14351",
"name": "Bontrager Adjustable Blendr 180mm Quill Stem",
"price": "31.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 9
}
,
{
"id": "24160",
"name": "Bontrager Comp 31.8 7 Degree Stem",
"price": "30.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 10
}
,
{
"id": "11249",
"name": "Bontrager Satellite Adjustable Quill Stem",
"price": "20.99",
"brand": "Lee Chi",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 11
}
,
{
"id": "24155",
"name": "Bontrager Line Pro 35 0 Degree Stem",
"price": "120.99",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "black",
"list": "More Options",
"position": 12
}
,
{
"id": "24637",
"name": "Bontrager RXL 7 Degree Factory Overstock Stem",
"price": "25.0",
"brand": "Bontrager",
"category": "Bike stems & accessories",
"variant": "white",
"list": "More Options",
"position": 13
}
]
}
});
}
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": "23999",
"name": "Bontrager Flare RT Rear Bike Light",
"price": "",
"brand": "Bontrager",
"category": "Bike lights",
"list": "",
"position": 2
}
,
{
"id": "23709",
"name": "Bontrager Ion 200 RT Front Bike Light",
"price": "",
"brand": "Bontrager",
"category": "Bike lights",
"list": "",
"position": 3
}
,
{
"id": "22466",
"name": "Bontrager Ion Pro RT Front Bike Light",
"price": "",
"brand": "Bontrager",
"category": "Bike lights",
"list": "",
"position": 4
}
,
{
"id": "14259",
"name": "Bontrager Ion 100 R/Flare R City Bike Light Set",
"price": "",
"brand": "Bontrager",
"category": "Bike lights",
"list": "",
"position": 5
}
,
{
"id": "13585",
"name": "Bontrager XR4 Team Issue TLR MTB Tire",
"price": "",
"brand": "Bontrager",
"category": "Bike tires",
"list": "",
"position": 6
}
,
{
"id": "21588",
"name": "Bontrager Commuter Comp Bike Saddle",
"price": "",
"brand": "Bontrager",
"category": "Bike saddles",
"list": "",
"position": 7
}
,
{
"id": "21829",
"name": "Bontrager RIDEtime Cycling Computer",
"price": "",
"brand": "Bontrager",
"category": "Bike computers & GPS",
"list": "",
"position": 8
}
,
{
"id": "23110",
"name": "Bontrager Gel Cork Handlebar Tape Set",
"price": "",
"brand": "Bontrager",
"category": "Bike handlebar grips & tape",
"list": "",
"position": 9
}
,
{
"id": "25484",
"name": "Bontrager Elite Water Bottle Cage",
"price": "",
"brand": "Bontrager",
"category": "Bike water bottles & cages",
"list": "",
"position": 10
}
,
{
"id": "22370",
"name": "Bontrager Comp MTB Pedal Set",
"price": "",
"brand": "Bontrager",
"category": "Bike pedals",
"list": "",
"position": 11
}
,
{
"id": "22373",
"name": "Bontrager Comp Multi-Tool",
"price": "",
"brand": "Bontrager",
"category": "Bike tools & maintenance",
"list": "",
"position": 12
}
,
{
"id": "25255",
"name": "Bontrager Standard Schrader Valve Bicycle Tube",
"price": "",
"brand": "Bontrager",
"category": "Bike tubes & tubeless bike tire accessories",
"list": "",
"position": 13
}
,
{
"id": "25254",
"name": "Bontrager Standard Presta Valve Bicycle Tube",
"price": "",
"brand": "Bontrager",
"category": "Bike tubes & tubeless bike tire accessories",
"list": "",
"position": 14
}
,
{
"id": "22824",
"name": "Bontrager Evoke Mountain Bike Glove",
"price": "",
"brand": "Bontrager",
"category": "Full finger cycling gloves",
"list": "",
"position": 15
}
,
{
"id": "13675",
"name": "Bontrager Ballista Road Cycling Shoe",
"price": "",
"brand": "Bontrager",
"category": "Road bike shoes",
"list": "",
"position": 16
}
,
{
"id": "25335",
"name": "Bontrager Cambion Mountain Bike Shoe",
"price": "",
"brand": "Bontrager",
"category": "Mountain bike shoes",
"list": "",
"position": 17
}
,
{
"id": "21726",
"name": "Bontrager Espresso Road Cycling Shoe",
"price": "",
"brand": "Bontrager",
"category": "Road bike shoes",
"list": "",
"position": 18
}
,
{
"id": "21727",
"name": "Bontrager Cortado Women's Road Cycling Shoe",
"price": "",
"brand": "Bontrager",
"category": "Road bike shoes",
"list": "",
"position": 19
}
,
{
"id": "14798",
"name": "Bontrager Rapid Pack",
"price": "",
"brand": "Bontrager",
"category": "Bike bags & panniers",
"list": "",
"position": 20
}
]
}
});
}
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, materials, and pricing. Prices shown are manufacturer's suggested retail prices.
Weights are based off pre-production products at time of publication. Weights may vary in final production.
var pr_merchant_user_id = "";
var pr_merchant_user_email = "";
var pr_api_key = "87b3f2f0-f542-43f9-bf33-10c41cffcb73";
var pr_locale = "en_US";
var pr_merchant_group_id = "10250";
var pr_merchant_id = "4404";
var pr_page_id = "28828";
if (pr_page_id === undefined || pr_page_id === null || pr_page_id.trim() === "") {
// default to sku if poerreviewid is null
pr_page_id = "28828";
}
var pr_write_review = "/us/en_US/equipment/cycling-components/bike-stems-accessories/bike-stems/bontrager-rhythm-comp-knock-block-stem-no-packaging/p/28828/writeReview?";
var pr_product_name = "Bontrager Rhythm Comp Knock Block Stem-No Packaging";
var pr_product_url = "https://www.trekbikes.com/p/" + "28828" + "/";
var pr_product_image = "//trek.scene7.com/is/image/TrekBicycleProducts/BontragerRhythmCompKnockBlockStem_28828_B_Primary?wid=690&hei=690&fmt=png8-alpha&qlt=80,1&op_usm=0,0,0,0&iccEmbed=0&cache=on,on";
if (pr_product_image && !pr_product_image.startsWith("http")) {
pr_product_image = "https:" + pr_product_image;
}
var pr_product_description = pr_product_name;
var pr_product_category_name = "Bike stems accessories";
var pr_product_manufacturer_id = "28828";
var pr_product_upc = "601842028551";
var pr_product_brand_name = "Trek";
var pr_product_price = "";
var pr_product_in_stock = "";
window.pwr = window.pwr || function () {
(pwr.q = pwr.q || []).push(arguments);
};