1968Cota247 Posted October 26, 2021 Report Share Posted October 26, 2021 What size rim locks/ bead locks do i need for a 1968 Cota 247 I have akront rims and will run 2.75x21 front and 4.00x18 rear. Thanks Quote Link to comment Share on other sites More sharing options...
lineaway Posted October 26, 2021 Report Share Posted October 26, 2021 The rim should have the size stamped in it. I does not go by tire size. Quote Link to comment Share on other sites More sharing options...
b40rt Posted October 26, 2021 Report Share Posted October 26, 2021 They should be marked wm1and wm2 or wm3 on the rear. Quote Link to comment Share on other sites More sharing options...
nh014 Posted October 26, 2021 Report Share Posted October 26, 2021 2.75 x 21 is a WM1 rim, 4.00 x 18 is a WM2 rim. Rim locks are identified as for WM1, WM2, WM3,etc. rims. 1 Quote Link to comment Share on other sites More sharing options...
b40rt Posted October 27, 2021 Report Share Posted October 27, 2021 (edited) A 247 rear will probably be wm3. 4.0 x18 can be either 2 or 3. Edited October 27, 2021 by b40rt 1 Quote Link to comment Share on other sites More sharing options...
lsv Posted October 27, 2021 Report Share Posted October 27, 2021 Rim info FYI. Rim lock needs to be suitable for size of rim and 21" rims are not always the same WM number - I know that from experience Hondas have used both 1.6 and 1.85 (WM1 and 2) on trials bikes. rims.pdf Quote Link to comment Share on other sites More sharing options...
feetupfun Posted October 27, 2021 Report Share Posted October 27, 2021 The tyre clamp size is the distance between the flanges in inches. 1.85 clamp fits rim with 1.85 inches between the flanges Quote Link to comment Share on other sites More sharing options...
1968Cota247 Posted October 27, 2021 Author Report Share Posted October 27, 2021 14 hours ago, nh014 said: 2.75 x 21 is a WM1 rim, 4.00 x 18 is a WM2 rim. Rim locks are identified as for WM1, WM2, WM3,etc. rims. so 1.60 for the front and a 1.85 for the rear? Quote Link to comment Share on other sites More sharing options...
b40rt Posted October 27, 2021 Report Share Posted October 27, 2021 Read the f**ken answers .... 1 Quote Link to comment Share on other sites More sharing options...
1968Cota247 Posted October 28, 2021 Author Report Share Posted October 28, 2021 (edited) So I took the old tires off and measured the front 21" and rear 18" rim. They are both 1.60 +/- These are akront rims and i believe them to be original to this bike, (1968/1969 year) 21M00389 Edited October 28, 2021 by 1968Cota247 Quote Link to comment Share on other sites More sharing options...
1968Cota247 Posted October 28, 2021 Author Report Share Posted October 28, 2021 On 10/26/2021 at 4:50 PM, lineaway said: The rim should have the size stamped in it. I does not go by tire size. Only stamp on rim is on WP Quote Link to comment Share on other sites More sharing options...
lsv Posted October 28, 2021 Report Share Posted October 28, 2021 Unusual to have such a narrow rim on the rear I would have thought, but the caliper doesn't lie. I would think that you will need two at 1.60" or WM1............... Quote Link to comment Share on other sites More sharing options...
feetupfun Posted October 29, 2021 Report Share Posted October 29, 2021 On 10/28/2021 at 12:50 PM, 1968Cota247 said: So I took the old tires off and measured the front 21" and rear 18" rim. They are both 1.60 +/- These are akront rims and i believe them to be original to this bike, (1968/1969 year) 21M00389 I've got a 1960's rear rim that width taken from a Bultaco so I'm not surprised to see that your old Cota has one too. Quote Link to comment Share on other sites More sharing options...
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