My seatpost is 30.9, seat clamp is 34.9. what bike does the OP have? When it comes down to it, answering the question of “how much dropper seatpost travel should I get?” starts with being honest with yourself about how much travel you really need based on your terrain, riding style, and type of bike. … You will need your frame and original rigid seatpost to make this determination. It may slide downwards if it is too big, or crack your seat tube if it is too tight. Finding the correct frame size is key to your safety and enjoyment, our guide walks you through everything you need to know in order to measure a bike frame. Watching this DIY tool designed to remove stuck seatposts from Stirling Bike Doctor work its magic is one of the most satisfying things we have ever seen. Some dropper posts are available in ‘stealth‘ versions. The 3t seatpost above is clearly stamped 26.4mm near to the top, while the Campagnolo Nuovo Record is … They work so well that they make it next to impossible to remove the battery from the seatpost. The seatpost binder width is about 21.4mm (photo below), and I > see bolts being sold in three sizes, 19, 22, and 25mm. How are these measured? Minimum seatpost insertion depth. Find out seatpost size? $194.95 RRP - $219.95 RRP. These are designs where the hose/cable enters the very bottom end of the seat post (rather than the normal desing where the cable enters the post at the head clamp end. Only steel frames and a shrinking number of XC bikes will accept the 27.2mm posts. > Hi all, I've got a stripped seatpost binder bolt, and am looking for a > replacement. Contact SL Zero Offset Seatpost 30.9x400mm. I have a set of calipers, so measuring isn't the problem, I just don't know what to measure. Is there an easy way of determining the correct size? The setback style forged seatpost made it easier for the rider to get to the same position relative to the pedals in a steeper-angled frame. Write your frame measurements along with the Reverb Stealth C1 measurements in the boxes below to determine the best seatpost length and travel for your riding style and frame fit. Do you measure the length of the post to the bottom of the clamp? I had to wipe it down a few times to get the amount low enough so that the seatpost wouldn't slowly sink into the frame, though. Hi, I need to buy a new seatpost clamp and front mech, can anyone tell me What I measure, is it the diameter or circumference? The comfort effects start to diminish once you get into the plus-size tyre range (3.0″) or wider (4.0-5.0″) where the tyres are absorbing so much that aluminium posts work fine. Once you have your measurements, use them as a guideline to find the right size bike. I got a sponsor from SDG and need to use there products only, so I need to get their seatpost now... BMXman I wish I was Canadian. The first thing to do when comparing sizes is to see if you will have enough room for proper seatpost extension. The circumference of the 30.9 clamp would be just over 97mm and the seatpost should be just over 94mm. It seems to vary from 25.2mm to 25.5mm. so I'd like to replace it with a nice alloy one. The seatpost on my commuter/hack bike is looking decidedly manky (lots of surface rust - it's not seized though!) Giant Contact SLR Seatpost. The most common seatpost diameters are 27.2mm, 30.9, 31.6 and 34.9mm - which one you need will be determined by your frame of choice. I measured the entire bolt and got around 30mm which is probably because I'm using something I found out the parts bin for the part the screws in as well as the OEM Campy female end. It may also damage your frame. Travel C Reverb AXS Total Length D Minimum Exposed Seatpost 100 340 165 125 390 190 150 440 215 170 480 235 E … How to Measure Your Seat Post Clamp Size. Giant D-Fuse Contact Composite Seatpost. After doing a little research, I'm noticing that they come in different sizes. Has anyone else tried this larger sized seat clamp? *Values will vary by rider and frame size. Contact SL 12mm Offset Seatpost 30.9x400mm. This guide can be a helpful tool for selecting the appropriate model of FOX Transfer Seatpost before purchase. Go. There are a number of benefits to using a dropper seatpost, chief among is the ability to lower the seatpost down, and out of the way to allow you to lower your center of gravity to dip, carve, pop and shred to your heart's content when attacking technical sections of trail. How do I find out what size I need: is it the external diameter of the seatpost itself, or of the bit of the frame that the clamp wraps around? Travel C Reverb Stealth B1 Total Length D Minimum Exposed Seatpost 100 340 165 125 390 190 150 440 215 170 480 235 C D HB Ho Hhalo Posts: 30. Determine your post size, then click on the size desired to continue to ordering page. The topics discussed here give you food for thought. Inside or outside diameter of the seat tube on the frame? Some Di2 seatpost battery holders work really well. One cool thing about a flex seatpost (and matching Redshift Shockstop stem) is that it allows you to use narrower tyres without sacrificing any comfort. More to the point, which of > the three would fit the bike's binder? Both of these conditions must be fulfilled.If, for example, lowest part of the top tube weld ends 50 mm below the seat tube top, inserting seatpost 25 mm below it won’t fulfill the requirement b) – of minimum 90 mm total insertion depth (seat post would be inserted 50 + 25 mm – so only 75 mm). Having a dropper seatpost is a huge luxury for every mountain biker. As you want the distance from sit bones to foot soles, simply subtract sitting height from standing height (wearing just socks, not shoes). There are two possible reasons: The seatpost may be stuck mechanically, for instance by being the wrong size and having been forced in; or, the problem may be chemical, caused by corrosion. However it's not marked with a size, and I don't have any calipers. All dimensions are measured in millimeter (mm). To size a mountain bike, measure the height for the seat tube by standing up straight with your back against a wall, using a tape measure to calculate the distance your pubic bone and the floor. Shop now Giant D-Fuse Contact Composite Seatpost. It has been an evolution over time based on where most riders prefer to sit. Write your frame measurements along with the Reverb Stealth B1 measurements in the boxes below to determine the best seatpost length and travel for your riding style and frame fit. Do I measure the entire bolt (including washers) or the actual part of the frame that the binder bolt goes into? *Values will vary by rider and frame size. I have a lingering worry that one of these days I'm going to snap a seatpost binder bolt. $109.95 RRP. In these cases you can usually get the battery out by taking a J-bend spoke and inserting it into the seatpost, hooking the bent part of the spoke behind the battery holder. I have just bought a new frame and require a 350mm seat post. A dropper seatpost operates via the use of a handlebar, or seatpost located remote lever. Average angles, average setback, average length saddle rails all combine to give an average range of rider positions. It is not common to find an Italian seatpost in French sizing, but 3t and Campagnolo gave their seatposts size stamps which is how all seatposts should be. How to measure seatpost binder bolt? $95.95 RRP. The frame's new enough to be 1-1/8 but old enough to have guides for canti brake routing. What could be the correct size? Does anyone know the EXACT seatpost size for the 2005 bighit FSR? Measuring your seat tube is not a difficult task to perform. Stealth. If you’re unsure of your seatpost size, simply remove your existng seatpost and there should be a number written on it somewhere. B. bigfella Über Member. spudly1979 . 26.8 is too big, 25.4 is too small, and I can't find anybody with a seatpost in between there to try out. Unfortunately I don't know seatpost size. It's got to be either 26 or 26.4, anybody know? sing your standard seatpost setup, measure the distance from the center of your saddle rails (CSR) down to the top of your bike’s seat collar/clamp (TSC).This is your seatpost extension length (SEL), or … 1 of 2 Go to page. Size. $109.95 RRP. Since dropper posts come in different travel options, different lengths, and different seat tube diameters, this is a tell-tale sign that not all dropper posts are the same and you need to find your fit before purchasing. All dimensions are measured in millimeter (mm). Overview. I'm not sure whether measuring the old post with a ruler would be accurate enough. Seatpost Clamp Size For the first time in my life I am thinking about buying an aftermarket seat-post clamp, but I don't know how to determine the size I need. Someone may be able to tell you the clamp size. Source: www.bikecad.ca Picture 3. Get your child to stand and then sit (legs straight out in front) with their back to a wall and measure to the floor from a book or ruler resting on their head. Seatposts come in different diameters – the three most widely used sizes for road bikes are 27.2mm, 31.6mm and the less common 30.9mm. I need a new seatpost clamp and I wanted to get a gold Hope one to match my QR skewers and inner rotor pieces. 12 May 2009 #1 Top; I have used a vernier calliper to measure the internal diameter of the seatpost of my old racing bike project. Shop now Contact SL Zero Offset Seatpost 30.9x400mm. Thanks! Shop now Contact SL 12mm Offset Seatpost 30.9x400mm. Diameter of the seatpost cant be accurately used to detetminr the seat clamp size. The clamp is at its maximum setting; I can't make it any tighter. I ended up trying a small amount of grease, and it helped quite a bit. I tried to find the specs but cant find anything. Don't go on trouser size for inside leg length: measure it. Are there any appreciable differences between the Campy and Sugino bolts? Next Last. 0. Similarly, if you ride a very small frame size and intend to have the saddle quite low, make sure there’s nothing obstructing a longer seatpost from slotting in. Thread starter bigfella; Start date 12 May 2009; 1; 2; Next. Mine is 26.6 (mid 90's Timberline). All dimensions are measured in millimeter (mm). Member. seatpost size – how do i know? The closest they make to my coiler's seatpost is the 30.9 and I was thinking that .9mm might not be too big of a difference. *Values will vary by rider and frame size. Determine Which 2017-2020 Transfer Seatpost Will Fit Your Bike Follow the steps below to determine which FOX Transfer Seatpost will work best for you and your bike frame. I want to get some spares, but want to get the right one. January 2012. Am wondering how the > bolt is measured, so I can buy the right one. Would appreciate a pointer. Sep 8, 2001 13,830 0 Victoria, BC. Location Essex. Measure the length of your current bike’s seatpost from BB to seat clamp, then compare it to the length of the two size options. Getting a wrong clamp size will not only affect its function, causing your seat to wiggle up and down, or to rotate sideways. Write your frame measurements along with the Reverb AXS seatpost measurements in the boxes below to determine the best seatpost length and travel for your riding style and frame fit. Step One: Determine compatible dropper travel range. Before you get serious about a stuck seatpost, you should find why it is stuck. 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