Dunlop MC 275 & MC 288 difference

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Does anyone know the difference between the two.
Having successfully laced and tensioned and put into use the rear, I'm now doing the front and noticed that the MK3 front used two different lacing patterns. One has the spokes either side of the valve hole as outer spokes and the other pattern has one spoke as inner and the other as outer. I thought this latter pattern was a mistake, but there is actually a late drawing for it, purely for the MK3.
Records suggest that there was only one style of rim used for pre MK3 and MK3, but clearly from threads here this is not the case, both the MC 275 and 288 were used.
I have laced my front rim which is AN (CWC) item exactly as the rim on my MK3, which is spokes either side of valve are inners. This leaves the non disc outer spoke with very little thread to utilise to get the offset.
Yet to try it, If I flip the rim, stamping on rim will be on nearside, and use the later spoke pattern it looks like the wheel will lace up nicely. I can't keep the rim as is, stamping on offside - like original, and use the later spoke pattern as inners will face the wrong way when laced.
This suggests some difference in the rims used on the MK3, any ideas.
 
Having successfully laced and tensioned and put into use the rear,

Assuming it's a CWC as there were two Mk3 rear rims, MC287 and MC289.
I'm now doing the front and noticed that the MK3 front used two different lacing patterns. I thought this latter pattern was a mistake, but there is actually a late drawing for it, purely for the MK3.


The standard pattern for the Mk3 is as below for the MC288 rim.
Dunlop MC 275 & MC 288 difference


Records suggest that there was only one style of rim used for pre MK3 and MK3, but clearly from threads here this is not the case, both the MC 275 and 288 were used.

Early Mk3s did have an MC275 rim but as far as I'm aware, with the spoke pattern altered (and rim reversed) to suit the Mk3 LH disc so the disc-side inner spoke is the brake tension spoke instead of the previous RH inner.


I have laced my front rim which is AN (CWC) item exactly as the rim on my MK3, which is spokes either side of valve are inners. This leaves the non disc outer spoke with very little thread to utilise to get the offset.

06-3923?
Length? Head angle?
 
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L.A.B,
Thanks, that's exactly how I have laced it, the length of the non disc outer spoke is 8.25'' and the head angle is over 90 degrees, it aligns nicely with the rim and hub, but seems too long.
Some will think it's a hole out, but it will not reach the next hole, if brought back the other way would be even longer.
Time to study the Rims, Dunlop would surely made the two rims differently.
 
the length of the non disc outer spoke is 8.25'' and the head angle is over 90 degrees, it aligns nicely with the rim and hub, but seems too long.

The info I have for the 06-3923 non-disc outer is 8 1/8" (100° 'long' bend).

Time to study the Rims, Dunlop would surely made the two rims differently.

Maybe also look up the MC286 (06-5730?) 0.300" nipple hole rear rim (and 9 gauge spokes) that AN doesn't offer for the Mk2/2A.
 
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