Park Tool 43.95mm Reamer and Spacer Set
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Product Feature
- Used with #690-XL Facing Cutter and #750 Centering Cone
Product Description
The #788 reamer is for head tubes with an inner diameter of 43.95mm designed to accept "internal" heaset cups with 44.05 - 44.10mm outer diameter (1-1/8" ZS standard).Park Tool 43.95mm Reamer and Spacer Set Review
The 44mm semi integrated headset standard (aka zero stack, press fit, integrated with cups) is very common, and every bike workshop or serious cycling enthusiast needs this cutter. Of course, it doesn't work by itself, rather it's another cutter that suits the Park Tool head tube reaming and facing set (usually HTR-1B).Many if not most head tubes need facing (for proper alignment of headset cups) but less frames tend to actually need reaming (for good fit of cups), especially the conventional type. If you don't have the conventional reamer, you probably won't ever miss it, plus that type at a pinch can be tweaked with a file. A bad zero stack frame however is another matter, and sometimes without the correct reamer for 44mm press in cups, little can be done to facilitate quality headset installations. Some head tubes are out of shape or poorly sized when they are made, but the manufacturer may opt to just bash in steel cups and not worry about it. If you encounter one of these frame, and have a quality new headset ready to install, I DO NOT suggest bashing it in or forcing it like crazy. This reamer will make nice work of the repair, and not damage the headset. Some later model tapered head tubes use this size on the top only, and a larger size at the bottom. Yes, that's another reamer again.
This is a relatively expensive cutter, but so too is the tool it fits. Fortunately the tool is expandable as required, and produces good results. For one-off facing or reaming operations, it's usually better to just pay a bike shop for them to use their tools. Remember to use plenty of cutting fluid, as it aids cutting and protects the tools edge ('Tap Magic' is great, Park CF-1 is terrible). Don't force the tool, don't drop it, keep it oiled in storage... and it should last a long time. It's suitable for all frame materials, but primarily alloy frames. Ti frames don't tend to use zero stack, old steel frames neither.
This is a must have tool when you must have it ;-) Recommended
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