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New Clarity owner here looking for a little help. I have a 2018 Base model. I did some searching on this forum and was hoping someone can help me verify this will work. I also called tire rack but the sales person said they don't have the dimensions for the clarity so they can't help me. My local dealer could also not verify that this would work.

I really want a full size spare for road trips and also live in an area where I need winter tires. I'm hoping to buy a set of winter tires/wheels and use one of them as a full size spare in case of emergencies. The idea would be to keep 1 winter tire in the trunk when I have summer tires on and 1 summer tire in the trunk when I have winter tires on. Would this work?

I verified the stock tire size to be 235/45/18 with a unique bolt pattern. I read here that many folks are buying Honda HV-R 17" rims for their winter tires. Could I buy 225/50/17 winter tires mounted to 17" wheels with the HV-R bolt pattern and get away with using one as a spare in case of emergencies? Is this a bad idea?

Thank you so much for your help. I don't know a lot about tires and really appreciate it. -Aaron
 

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I'm not an expert but that seems the same time size this guy is doing - I would think that would work (you probably already came across this video if you have sorry) I would wonder about the weight of the wheel vs. the ones that came with the clarity but this guy seems to make it work.
 

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You're welcome (hope it works cringe I don't blame you for doing your homework on this one.. but least 17" tires would give a more softer ride which would be perfect for snow anyway..) anyway hope it works out - you're smart to do that.
 

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New Clarity owner here looking for a little help. I have a 2018 Base model. I did some searching on this forum and was hoping someone can help me verify this will work. I also called tire rack but the sales person said they don't have the dimensions for the clarity so they can't help me. My local dealer could also not verify that this would work.

I really want a full size spare for road trips and also live in an area where I need winter tires. I'm hoping to buy a set of winter tires/wheels and use one of them as a full size spare in case of emergencies. The idea would be to keep 1 winter tire in the trunk when I have summer tires on and 1 summer tire in the trunk when I have winter tires on. Would this work?

I verified the stock tire size to be 235/45/18 with a unique bolt pattern. I read here that many folks are buying Honda HV-R 17" rims for their winter tires. Could I buy 225/50/17 winter tires mounted to 17" wheels with the HV-R bolt pattern and get away with using one as a spare in case of emergencies? Is this a bad idea?

Thank you so much for your help. I don't know a lot about tires and really appreciate it. -Aaron
Another option to consider, I have seen comments about the Michelin CrossClimate+ (and its successor the CrossClimate 2) that they make for a decent winter tire on the Clarity even though they are all season, so some people are just running them all year rather than maintaining a separate set of winter tires/wheels. Something you may want to research to see how prevalent that opinion is, especially from people who live in areas that get a similar level of snow that you do. Although apparently the 235/45/18 size is not always in stock but that wouldn't be a problem if you aren't in a rush to replace your OEM's.

If you did decide to go that route then the choice of a spare would be a separate decision. Ideally the spare would also be 235/45/18. For short term driving using a different size spare can be okay depending on how different it is. Obviously people use donut spares which are a different size, but then you are supposed to keep the speed down, don't drive too far, etc. For some sizes of full size spare you might be able to go farther and faster. But when in doubt using the same size as OEM would be preferred as you would have no restrictions. You could even consider buying a fifth Clarity wheel, expensive if new but if you shop online you should be able to find a used one. Although even if you bought a new one you could save some money by skipping the aerodynamic wheel cover, which are surprisingly expensive.
 

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Discussion Starter · #6 ·
Another option to consider, I have seen comments about the Michelin CrossClimate+ (and its successor the CrossClimate 2) that they make for a decent winter tire on the Clarity even though they are all season, so some people are just running them all year rather than maintaining a separate set of winter tires/wheels. Something you may want to research to see how prevalent that opinion is, especially from people who live in areas that get a similar level of snow that you do. Although apparently the 235/45/18 size is not always in stock but that wouldn't be a problem if you aren't in a rush to replace your OEM's.

If you did decide to go that route then the choice of a spare would be a separate decision. Ideally the spare would also be 235/45/18. For short term driving using a different size spare can be okay depending on how different it is. Obviously people use donut spares which are a different size, but then you are supposed to keep the speed down, don't drive too far, etc. For some sizes of full size spare you might be able to go farther and faster. But when in doubt using the same size as OEM would be preferred as you would have no restrictions. You could even consider buying a fifth Clarity wheel, expensive if new but if you shop online you should be able to find a used one. Although even if you bought a new one you could save some money by skipping the aerodynamic wheel cover, which are surprisingly expensive.
Thank you for the additional option. I really appreciate your comments.
 

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I wrote the instructions for using a full size spare but I'll be ordering one of the Modern Spare systems. I do recommend you keep the air compressor in the car since the spare tire almost never gets checked for air pressure.
 

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Also be aware that if you have a flat on the front, you'll need to transfer a wheel/tire from the back, and put the spare on the back. Running a significantly different tire diameter on either side on the drive axle will cause all sorts of errors, and can significantly damage the transaxle due to rotational speed differences.
 

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FYI. I planned a long distance drive in my 2018 Clarity and decided it was time to get that spare...Just in case. I bought a 2005 Infinity G35 Coupe spare tire and wheel. The wheel rim is 17" x 4" and the tire is a Bridgestone spare tire 145/80D17. I did a test replacement of a rear wheel and it fit perfectly, same bolt pattern with no need for a spacer. I took it for a test drive and all seemed good. It looked like it was new and had never been on the ground. It was only $68 as a used part. It may be worth checking parts suppliers or EBay for similar spares. I know that the later G35s 2013 and newer were recommended, but I took a chance on the older 2005 G35 spare and was satisfied. The 2005 and up are 17". the 2004 and lower are 16" spare. Go for the 17". This spare came from a coupe, but I would think the other G35 Infinity's from the same era would use the same size spare. Just make sure an older tire has no cracks from outside exposure. As I would only need this spare for a hopefully short distance, I am not worried about using an old tire. It holds the 60 PSI required pressure just fine. I think a cheaper, thinner, lighter 4" spare that takes up less space in the trunk may be a better solution than a full size spare tire and wheel that may never be used.
 

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FYI. I planned a long distance drive in my 2018 Clarity and decided it was time to get that spare...Just in case. I bought a 2005 Infinity G35 Coupe spare tire and wheel. The wheel rim is 17" x 4" and the tire is a Bridgestone spare tire 145/80D17. I did a test replacement of a rear wheel and it fit perfectly, same bolt pattern with no need for a spacer. I took it for a test drive and all seemed good. It looked like it was new and had never been on the ground. It was only $68 as a used part. It may be worth checking parts suppliers or EBay for similar spares. I know that the later G35s 2013 and newer were recommended, but I took a chance on the older 2005 G35 spare and was satisfied. The 2005 and up are 17". the 2004 and lower are 16" spare. Go for the 17". This spare came from a coupe, but I would think the other G35 Infinity's from the same era would use the same size spare. Just make sure an older tire has no cracks from outside exposure. As I would only need this spare for a hopefully short distance, I am not worried about using an old tire. It holds the 60 PSI required pressure just fine. I think a cheaper, thinner, lighter 4" spare that takes up less space in the trunk may be a better solution than a full size spare tire and wheel that may never be used.
Verify that the diameter/circumference is the same as the other tire, especially before using it on the fronts. A difference in size will result in the wheels turning at different rates on the same axle. It can cause all kinds of problems with traction control, ABS, stability programs, and can even do significant damage to the transaxle, if used with a different size tire and wheel on the drive axle.

This is true with the little donut spares, too. If there's a flat on the drive axle, swap a (hopefully) matching tire/wheel from the non-drive axle to the drive axle, and then put the donut spare on the non-drive axle location.
 

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After a terrible experience getting a flat tire from a pothole last night and learning that I had locking lugs but no key, I've decided to get a spare one way or the other, and this thread is the most useful I've found so far. So I want to contribute something helpful. I made a spreadsheet that calculates approximate tire dimensions from the tire sizes. I used it to pick tires and wheels for my 93 accord race car. I wanted smaller diameter to get a lower effective final drive ratio which would have the effect of giving us lower and tighter gear ratios. Sounds weird but it made a huge difference.

Anyway a 145-80-17 tire mentioned by Phantom Clarity has an outer diameter 99.2% of the standard Clarity tire 235-45-18. An 0.8% difference would be well within the range of normal tire wear. So this should work just fine.

I think I will try it instead of the much more pricey Modern Spare option (which is an excellent option to know about). Thanks to everyone who contributed to this thread. Good stuff.
 

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Using different sized tires and wheels as a full-size spare is definitely possible, and many people do it. However, it's important to keep in mind that the spare tire will likely have different handling characteristics than the other tires on the car. This can be especially noticeable in winter conditions. For that reason, it's generally recommended to use the same size tire and wheel as the other tires on the car. In your case, that would be a 17" wheel with a 225/50/17 tire.
 

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Using different sized tires and wheels as a full-size spare is definitely possible, and many people do it. However, it's important to keep in mind that the spare tire will likely have different handling characteristics than the other tires on the car. This can be especially noticeable in winter conditions. For that reason, it's generally recommended to use the same size tire and wheel as the other tires on the car. In your case, that would be a 17" wheel with a 225/50/17 tire.
I'll also add that putting a different sized (diameter) wheel/tire combo on a drive wheel can destroy the transaxle, because the wheels rotate at different speeds. This is especially a problem with the so-called "donut" spares that have dramatically different diameters than the standard wheel/tire. It can also confuse the TPMS, ABS, Traction Control and Stability systems.

You can mitigate the transaxle damage problem by swapping a same-sized tire/wheel from the non-drive axle, to the drive axle, and putting the spare on the non-drive axle location. On FWD vehicles, you'd remove a rear wheel, and put the spare there, and then put the removed rear wheel on the front, replacing the flat.
 
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