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M Part Seat Clamp Mount

Now £6.99
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Product Description

Got a bike with no rack mount, but want to fit a rack?
    • The rear of this seat clamp has bosses which allow a rear rack to be securely fitted
    • 31.8 mm internal diameter
    • Ideal for bikes with small frames and no rack braze-ons
    • Also suitable for bikes with wishbone rear stays
    • Matt black finish with stainless steel hardware

M Part Seat Clamp Mount Reviews

Write your own review
Overall Rating:
4.4
out of 5
4.42
Build Quality
4.50
Performance
4
Value For Money
4.50

Customer Reviews (4)

5
Perfect solution

This is the second of these that I've bought. The first was for my wife's Whyte bike which has an odd frame for which something like this is the only solution when it comes to fitting a rack. This second one got me out of a hole (no pun intended). My Specialized Tri-Cross actually does have lugs on the seat stays, but because I'm repeatedly fitting and removing the rack the inevitable happened one day when I stripped the threads in one of them. I successfully fitted a Helicoil, and then thought I would fit one to the as yet unstripped side, just as an insurance against the same thing happening again. Big mistake. This time the clinch nut in the stay didn't survive being drilled out. This seat clamp mount solves the problem elegantly. It even offers better alignment with the rack's connecting rods but that's just the luck of the draw. I was concerned about ordering the correct size. Remember - it's the external diameter of the seat tube that's needed, not that of the seat post itself. Here's a good reference that may help: http://www.bikeradar.com/forums/viewtopic.php?t=12829977 The only thing stopping this being straight-fives was that the black coating had a missing patch. No effect on the function, but not quite 100%.

This is the second of these that I've bought. The first was for my wife's Whyte bike which has an odd frame for which something like this is the only solution when it comes to fitting a rack. This second one got me out of a hole (no pun intended). My Specialized Tri-Cross actually does have lugs on the seat stays, but because I'm repeatedly fitting and removing the rack the inevitable happened one day when I stripped the threads in one of them. I successfully fitted a Helicoil, and then thought I would fit one to the as yet unstripped side, just as an insurance against the same thing happening again. Big mistake. This time the clinch nut in the stay didn't survive being drilled out. This seat clamp mount solves the problem elegantly. It even offers better alignment with the rack's connecting rods but that's just the luck of the draw. I was concerned about ordering the correct size. Remember - it's the external diameter of the seat tube that's needed, not that of the seat post itself. Here's a good reference that may help: http://www.bikeradar.com/forums/viewtopic.php?t=12829977 The only thing stopping this being straight-fives was that the black coating had a missing patch. No effect on the function, but not quite 100%.

Close review
4.7 out of 5
Build Quality: 4/5
Performance: 5/5
Value For Money: 5/5
4
Watch out for dimensions

I bought the 31.8 for a 30.9 seatpost. Unfortunately the clamp has a lip on the inside so the diameter isn't 31.8, but probably about 29.8 (therefore not fitting a 30.9 seatpost). Luckily someone with some heavy duty machinery was able to remove the lip for me. Now fitted the clamp works fine.

I bought the 31.8 for a 30.9 seatpost. Unfortunately the clamp has a lip on the inside so the diameter isn't 31.8, but probably about 29.8 (therefore not fitting a 30.9 seatpost). Luckily someone with some heavy duty machinery was able to remove the lip for me. Now fitted the clamp works fine.

Close review
4 out of 5
Build Quality: 5/5
Performance: 3/5
Value For Money: 4/5
5
Clever device

After moving to a new bike without rack mounts I needed a solution to attach my rack. This seat clamp is cheap, good looking and functional. The 31.8mm clamp fit my frame which uses a 27.2mm seatpost.

After moving to a new bike without rack mounts I needed a solution to attach my rack. This seat clamp is cheap, good looking and functional. The 31.8mm clamp fit my frame which uses a 27.2mm seatpost.

Close review
5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5
4
Does the job very well

I ended up fitting this to the seatpost of my wifes very small 650c wheeled racing bike in order to the pannier rack to fit better. It works very well for this purpose as the rack now sits at better angle and is far cheaper than the alternative.

I ended up fitting this to the seatpost of my wifes very small 650c wheeled racing bike in order to the pannier rack to fit better. It works very well for this purpose as the rack now sits at better angle and is far cheaper than the alternative.

Close review
4 out of 5
Build Quality: 4/5
Performance: 4/5
Value For Money: 4/5

Seatposts Guide

What are seatposts?

The seatpost is the extendable metal rod that slots into your bike’s frame, with a clamp at the top to hold your saddle.

Who needs a seatpost?

Every bike has a seatpost, but a common reason for fitting a new one is to get a longer post for a leggy rider. Weight saving is another prime reason for upgrading.

What are the choices?

You need to pick the right seatpost width for your frame, but then you will have a choice of materials, from practical aluminium to weight-saving carbon. Mountain bikers can also opt for dropper posts, which are tremendously useful out on the trails.

What should I buy with them?

You might need a different seatpost clamp to go with your new seatpost and hold it firm in your frame.

Anything else?

Finding out which seatpost width you need can be a tricky business. With luck it will be stamped on the inside of your bike’s seat tube. It is measured down to tenths of millimetres, so eyeballing it with the tape measure won’t work.

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If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.