lightheir wrote:
endorphin wrote:
Go for beam style instead of click style. They are cheaper and more reliable. Click style wreches, especially cheaper ones, can require periodic calibration, or you risk over/under-torquing parts.
As for manufactures, I like my Park Tool TW-1 (high torque) and TW-2 (low torque) beam style wrenches. But really any hardware store version is fine - no need to be cycling specific. It can be a tricky to find one for lower torque spec (<6 Nm).
Do you need 2 different wrenches for hi/lo, or can you buy one? These torque wrenches are typically a bit pricey!
You need both to do every bolt on a bike. The TW-1 does 0-7 Nm and the TW-2 does 0-70 Nm. You wouldn't have enough precision using the TW-2 for low torque bolts since the increments on the scale are too large. The TW-1 couldn't do high torque applications like the cassette lock ring or threaded BB.
In practice, I think you could get away with just having a low torque wrench. It's really only the low torque bolts (stems, steerer tube, brakes, seat post, derailleurs, etc.) where accuracy is critical. Plus or minus a few Nm won't make or break your BB but it could certainly cause your handlebars to crack or slip.
And properly torquing bolts is more important for carbon parts than for aluminum parts. IME, aluminum is a lot more forgiving, at least when it comes to over-torquing.
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