IRD RollerDrive 1 Inch Threaded Headset - Silver

Customer Reviews (1)
5 / 5| Write your review
£86.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Needle bearings sometimes will fix bikes with fork shimmy. May also improve handling on bikes with loaded handlebar bags.
- Needle bearings in the lower assembly
- Ball bearing retainer in the upper
- Stack height 35.9mm
- Aluminum cups with shiny zinc-plating
- EC30/25.4 24tpi EC30/2.4
- Weight: 110g
- Made in Japan
Product Reviews (1)
Questions & Answers (1) Q & A
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Product Reviews (1)
Overall Product Rating 5 / 5
By Ben Hemmens
10 Apr 2019
5 / 5
I recommend this product
ConsA bit on the bulbous side sitting above a tapered fork crown
ProsSeems to be a shimmy solver
Have a very nice old custom 531 frame which however has always had to my feel slightly tricky steering. Including one memory of a speed wobble and generally never having been able to ride the bike no hands.
The old headset being well and truly worn out and noting the various claims of roller bearings as being an anti-shimmy measure, I got this one. Steering immediately feels much better. Steadier and smooth at low speed where it was always strangest and I think that made me not trust it when going faster. Will test it out on a proper hilly ride with fast bits soon but first impression is very much that the anti-shimmy claims were right.
Questions & Answers (1)
Crown race?
18 Apr 2020
Hi, what is the crown race of this headset? The IRD website says 26.4, but I'm confused by the numbers in the description here - what are the EC numbers?

Hi, The crown race are the bearings at the bottom next to the fork. EC refers to External Cup, the number refers to the inside diameter of the headtube. However these are not actual measurements they are a way of classifying headset groups. If you have an inch steerer tube then this will fit. Thanks 20/04/2020