How has Middleburn’s RS7 stood up to the abuse?
There’s a lot of talk about how stiff various cranks are. These ones are stiff, although I can’t say that cheap ones feel flexy. The Middleburn RS7 crankset is also on the light side. They’re made out of quality alloy in the UK. They’re a little bit pricey, with a RRP for the arms & a spider around £150 but you often see them for a fair but less than the RRP. They do have a lifetime guarantee which includes DH & dirt jumping. It doesn’t cover the splines but it’s rare that they would go on any crank in use. I would guess the disclaimer there is to avoid paying out for dodgy fitting. If you want even lighter still, the RS8’s still have a lifetime guarantee but not for DH & jumping.
What About the Bottom Bracket Standard?!
[edit 2019] – Middleburn went out of business but are back, now made by BETD
They’re available in square taper & ISIS. Stop, I hear you say, but aren’t ISIS BB’s the worst product ever invented? [EDIT – when written, the now more well known organisation with these initials didn’t exist…] Well they seem to have a bad rep, but in my experience if you get a quality BB, (not necessarily the most expensive), they last as long as the old square tapered ones. The axles are larger diameter & therefore stronger. The FSA Platinum I first used lasted 16 months of hard use before any play developed. It was replaced by a Superstar a couple of months ago, the design of which makes total sense, so I’m expecting that to do well. As a comparison, the best I’ve had from an external type BB is 6 months, the worst is 3 rides! Before anyone asks, yes the BB shell was faced. There are better units available now, however, from Hope, Chris King & others.
Although these have a triple, Middleburn use replaceable spiders & you can fit a lightweight XC double where the inner ring is also the spider for the big ring. Uno setups do away with a spider, the ring fits where the spider would normally. Spiders are available in XC & DH versions, and trials set-ups are also available. In the more standard config, you can get various 4 or 5 bolt types including one for XTR cranks to allow you to run your own choice of rings.
Lastly, a word about chain rings. The pic shows Middleburn’s own fitted to my set of RS7’s. I use these because they seem to last better than most. It’s very hard to decide on a longest lasting make of chain ring, because the conditions & the weather make it a bit variable, but these seem to do the job. The granny ring has been on other cranksets, so it’s 2 years old or more, The big ring isn’t showing any signs of wear & it’s about 6 months old & the middle ring (gets the most use) is still going after a good few months, but has some wear. Not enough yet to need replacing, but enough that you can see it. The one on there at the mo is a hardcoat, unlike the older one in the pic.
To sum up, buy a set of RS7’s if you don’t mind shelling out a bit of cash for something that will last. They’re due to release an external set sometime soon, so you may want to wait for that – I’d say there’s no need, this one is fine. Another UK product that works & works well.